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Mandalay Resources Provides Half-year Exploration Updates for its Costerfield, Björkdal and Cerro Bayo Mines and its Challacollo Feasibility Project


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Mandalay Resources Corporation

29 Jul, 2015, 12:53 GMT

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TORONTO, July 29, 2015 /PRNewswire/ --

Mandalay Resources Corporation ("Mandalay" or the "Company") (TSX: MND) is pleased to provide half-year exploration updates for all its sites.

Brad Mills, CEO of Mandalay, commented, "Our exploration programs across the Company continued on track to replace reserves and identify new potential areas for future growth. At Costerfield, infill and extensional drilling of the Cuffley lode above the King Cobra fault has delivered mineralized intercepts that are expected to support additional reserves at the end-of-year estimation. More exciting, we are confirming the extension of the Cuffley lode below the King Cobra fault in new intercepts and believe the shoot continues strongly at depth."

Mr. Mills continued, "At Cerro Bayo, drilling under Laguna Verde is revealing the southeast and depth limits of the Coyita vein, with a large gap between the northwest and southeastern zones (already estimated as Proven and Probable Mineral Reserves) still to be filled in during the second half of the year. The newly discovered Camila vein to the northeast of Coyita is also emerging as a target for infill drilling. Drilling to further define the Yasna vein under the lake will continue in the second half, as will widely spaced holes to develop an initial understanding of additional vein potential under the rest of Laguna Verde."

"At Björkdal, we are focused on rebuilding the fundamental geological understanding of the mineralizing system, which increasingly appears to be contact metasomatic in origin, with multiple newly-recognized vein orientations. Abundant gold-bearing intercepts in open pit and underground extensional drilling as well as in initial drilling at the Rönnberget target (some 5 km to the east of the mine) demonstrates not only that the known mineralized zones are open to extension but that that gold is widely distributed in the district. Drilling for the rest of the year aims to grow the resource base available to open pit mining in the shortest term, to expand the limits of the underground resource to support application for expanding the mining concession and to test regional targets."

"Finally, at Challacollo, our feasibility study is nearly complete, with identification of a suitable water source for the proposed operation being the significant remaining factor. We have decided to postpone submitting our EIS application until the water source can be specified, giving us a period of time to optimize the project with further exploration, as well as plant, capital cost and operating cost refinements."

Costerfield  

Drilling, Sampling, and Assaying  

During the first half of 2015, Mandalay drilled 4,515 m of diamond core in 19 holes. In addition, the Company completed 1,721 m of on-vein operating development and associated sampling of the N- and Cuffley lodes. Drill core was logged and sampled by Costerfield geologists, who also mapped and sampled the development advances. All samples were sent to Onsite Laboratory in Bendigo, Victoria, Australia, for sample preparation and assay. Site geological and metallurgical personnel have implemented a QA/QC process that includes the regular submission of standard reference materials and blanks with drill and face samples submitted for assay. Standard reference materials have been certified by Geostats Pty Ltd. Please see the Company's previously filed technical report, "Costerfield Operation, Victoria, Australia, NI 43-101" dated March 31, 2015 and available on SEDAR (http://www.sedar.com ), for a full description of the drilling, logging, assaying and estimation processes, including data verification procedures.

Drill Results  

Assay results are summarized in Tables 1, 2 and 3 below; they are displayed in geologic context in Figures 1, 2, and 3.

Cuffley Main (Table 1; Figures 1, 2 and 3)

  • Four new intercepts were generated, one high-grade (AD119), one medium-grade (AD127), and two low-grade (AD118, AD126).
  • These intercepts were generated incidental to reaching the primary target in the Cuffley Deeps zone below the Tiger Fault and are not expected to significantly change the estimated resources in the Cuffley Main Zone as they penetrated the Main Zone within the boundaries of already-Indicated Resource.
  • However, they do increase the level of confidence for mine planning in the area.

Table 1: Significant new drill intercepts on Cuffley Main  

   
                                                                               AuEq
                      Intercept Intercept             True                     (g/t) Total
           Hole       Easting   Northing              Widt Gold  Antimony      over  Hole
    Hole   completion (Mine     (Mine       Elevation h*   Grade Grade         1.8m  Depth
    ID     Date       Grid, m)  Grid, m)    (m)       (m)  (g/t) (%)           **    (m)
    AD118  13/01/2015 15178     4922        823       0.36 0.4   0.0           0.1   240.3
    AD119  23/01/2015 15189     4874        825       1.09 37.0  8.30          32.5  330.3
    AD126  5/05/2015  15187     4764        828       0.71 1.4   0.1           0.6   250.3
    AD127  25/05/2015 15201     5014        844       0.35 44.5  12.5          13.7  198.7
    * True width is preliminary estimate only and may not
    reflect final true width used in resource estimate

                                      Price per 10 Sb(kg) x Sb
    ** AuEq(g/t) = Au(g) + Sb(%) x    Recovery (%)
           Price per 1 Au(g) x Au recovery (%)

Cuffley Deeps (Table 2; Figures 1 and 3)

  • High- and medium-grade mineralization is proved to continue downward into the currently Inferred Resource in Cuffley Deeps in AD114, AD116, AD118, AD121W1, AD123, and AD124W1.
  • These intercepts suggest a zone of high-grade mineralization just below the Tiger fault at the top and just above the King Cobra fault at the bottom of the fault block, with the intervening material inadequately drilled.
  • Mandalay believes the upper high-grade zone below the Tiger fault will support mining development and convert to reserves at year-end. The lower zone just above the King Cobra may not, but it could significantly enhance the viability of potential deeper development to reach emerging mineralization under the King Cobra fault (see below).
  • There is a significantly mineralized splay emerging in the Deeps block, intercepted in AD118, AD121W1 and AD129W1.

Cuffley below the King Cobra fault (Table 3, Figure 3)

  • Hole CSK001 intercepted a 28 m wide zone of quartz-stibnite-gold veins and veinlets, with the best (559 m elevation) containing 39.7 g/t Au and 1.4% Sb over 0.13 m.
  • This intercept is believed to be correlative with AD107, drilled and announced in 2014, which contained similarly high gold/low antimony values.
  • If this is true, then the two intercepts represent a zone with a strike length of at least 200 m and a depth extent of at least 100 m. CSK001 is the first of 8 holes planned to test below the King Cobra fault during the balance of 2015.

Table 2: Significant new drill intercepts on Cuffley Deeps  

   
                                                                                AuEq
                                                                                (g/t
                          Intercept Intercept             True                  )    Total
               Hole       Easting   Northing              Widt Gold  Antimony   over Hole
               completion (Mine     (Mine       Elevation h*   Grade Grade      1.8m Depth
    Hole ID    Date       Grid, m)  Grid, m)    (m)       (m)  (g/t) (%)        **   (m)
    AD113      1/12/2014  15195     5041        851       0.16 11.6  8.8        2.6  180.3
    AD114      25/11/2014 15177     5128        846       2.03 11.2  11.9       35.2 234.2
    AD115      12/12/2014 15166     5204        843       0.71 0.8   0.3        0.6  247.9
    AD116      4/12/2014  15170     5164        846       1.97 5.4   3.1        11.7 218.9
    AD117      9/12/2014  15179     5084        798       0.10 27.0  8.0        2.4  209.5
    AD118      13/01/2015 15177     4923        825       0.52 39.7  26.9       27.2 240.3
    AD118***   13/01/2015 15172     4915        819       0.17 116.5 8.8        12.9 240.3
    AD119      23/01/2015 15154     4830        798       0.14 2.6   0.6        0.3  330.3
    AD120      2/02/2015  15171     4964        813       0.33 1.1   0.1        0.3  207.7
    AD121W1*** 13/02/2015 15177     4981        697       1.41 2.8   1.2        4.1  270.2
    AD121W1    13/02/2015 15172     4979        688       1.28 4.5   4.5        9.7  270.2
    AD122      23/02/2015 15173     4991        740       1.83 1.5   0.2        1.9  240.5
    AD123***   1/04/2015  15158     4883        784       0.05 133.4 6.1        3.8  297.4
    AD123      1/04/2015  15136     4858        763       0.21 34.3  20.8       8.7  297.4
    AD124W1    18/03/2015 15162     5112        677       0.10 367.3 3.0        21.4 308.0
    AD125W1    17/04/2015 15172     4960        725       0.07 19.5  5.8        1.2  245.3
    AD126      5/05/2015  15111     4748        788       1.41 1.8   0.2        1.8  250.3
    AD127      25/05/2015 15177     5009        827       0.18 1.1   0.2        0.1  198.7
    AD128      19/05/2015 15129     4815        687       0.05 14.9  3.8        0.6  317.8
    AD129W1    5/03/2015  15168     4933        689       1.30 2.9   0.9        3.4  320.4
    AD129W1*** 5/03/2015  15157     4925        674       0.05 17.7  11.6       1.2  320.4
    * True width is preliminary estimate only and may not reflect
    final true width used in resource estimate

                                          Price per 10 Sb(kg) x Sb
    ** AuEq(g/t) = Au(g) + Sb(%) x        Recovery (%)
               Price per 1 Au(g) x Au recovery (%)

    *** Intercept on a splay vein proximal to the continuous lode
    structure.

Table 3: Significant new drill intercepts on Cuffley lode from below the King Cobra fault 

   
                                                                               AuEq
                                                                               (g/t
                       Intercept   Intercept           True                    )    Total
            Hole       Easting     Northing            Widt Gold  Antimony     over Hole
            completion (Mine       (Mine     Elevation h*   Grade Grade        1.8m Depth
    Hole ID Date       Grid, m)    Grid, m)  (m)       (m)  (g/t) (%)          **   (m)
    AD107   23/10/2014 15154       5226      675       0.09 173.0 0.0          9.1  413.5
    CSK001  22/06/2015 15158       5025      585       1.45 0.2   1.4          2.4  449.4
    CSK001  22/06/2015 15151       5024      579       0.09 0.4   3.0          0.3  449.4
    CSK001  22/06/2015 15147       5024      576       0.08 0.1   4.4          0.4  449.4
    CSK001  22/06/2015 15143       5023      573       1.15 0.6   1.0          1.7  449.4
    CSK001  22/06/2015 15141       5023      571       0.93 1.8   1.4          2.6  449.4
    CSK001  22/06/2015 15122       5021      559       0.13 39.7  1.4          3.1  449.4
    * True width is preliminary estimate only and may not reflect
    final true width used in resource

    ** AuEq(g/t) = Au(g) +
    Sb(%) x                        Price per 10 Sb(kg) x Sb Recovery (%)
            Price per 1 Au(g) x Au recovery (%)

Cerro Bayo 

Drilling, Sampling and Assaying 

A total of 11,076 m of NX and BX diamond core were drilled in 27 holes at Cerro Bayo during the first six months of 2015, including three holes still in progress on June 30. All of these holes were drilled from surface platforms on the margins of Laguna Verde, except for DLV15-022, collared in an underground station on the Dagny vein 70 m level. All drill holes were directionally surveyed except for DLV15-002, in which a twisted-off drill pipe precluded measurements by the downhole instrument. In addition, a total of 3,191 m of on-vein development drifts were completed during the period.

Drill core was logged and sampled by staff geologists, who also performed mine mapping and sampling. All core and face samples (including blanks, standards and duplicates) were submitted to the on-site assay laboratory of Compañia Minera Cerro Bayo. The Cerro Bayo assay laboratory was audited in 2011 by SGS Lakefield Research Ltd. And routinely sends check samples to the ALS laboratory (ISO 9001:2008 and ISO/IEC 176025:2005 certified) in La Serena, Chile, following QA/QC practices established by the parent Company Mandalay Resources. Please see the Company's previously filed technical report, "Technical report on the Cerro Bayo project, Region XI (Aysèn) Chile", dated March 31, 2015 and available on SEDAR (http://www.sedar.com), for a full description of the drilling, logging, assaying and estimation processes, including data verification procedures.

Drill Results 

Coyita vein 

Eighteen new drill holes completed during the first six months of 2015 infilled and modestly extended the Coyita SE segment under Laguna Verde and the peninsula (Table 4, Figures 4, 5a and 5b). The Coyita SE segment largely has been closed off at depth north of the Falla Peninsula, but still remains open at depth to the south. Complex fault relations and postmineral dikes south of the Falla Peninsular create some uncertainty in correlations of the Coyita vein in this block that will be resolved with additional drilling. More step-out drilling also is planned for the Coyita NW segment, to test for the extension of the vein beneath a postmineral andesite sill that currently bounds an ore block. Drilling from the end of the peninsula indicates that mineralized, subordinate splays or branches of the Coyita system extend into altered rocks on the hanging wall of the main vein to the northeast, with the most prominent of these being the Camila vein (Table 5, Figure 6). This sector will be tested in future exploration efforts.

Table 4: Significant new drill intercepts tentatively correlated with the Coyita vein  

   
                           Total
                 Hole      Hole                         Intercept               Intercept
                 Compl.    Depth  Intercept Intercept   Elevation From          Length   
    Hole_ID      Date      (m)    UTM_E     UTM_N       (m)       (m)    To (m) (m)      
    DLV15-001    1/14/15   318.2  272297.29 4840678.98  10.09     288.15 289.95 1.8     
    DLV15-002    3/02/15   345.7  272287.05 4840664.6   53.06     260.46 260.78 0.32
    DLV15-003    3/16/2015 442.95 272157.98 4840944.63  -18.51    401.43 403.73 2.3      
    DLV15-004    2/13/2015 377.15 272120.63 4840918.4   120.83    324.8  327.94 3.14     
    DLV15-005    3/13/2015 298    272197.55 4840786.34  94.9      233.85 235.2  1.35
    DLV15-007    3/24/2015 293.6  272193.04 4840834.039 49.3      267.05 268.67 1.62   
    DLV15-008    3/23/2015 418.35 272199.12 4840884.35  -61.25    398.65 400.3  1.65  
    DLV15-010    10/09/15  326.65 272223.05 4840809.1   -7.06     297.25 304.86 7.61  
    DLV15-011    4/15/2015 507.9  272137.26 4840998.69  -72.66    467.05 468.5  1.45
    DLV15-014    4/21/2015 412.25 272297.79 4840621.2   -2.75     311.43 311.89 0.46
    DLV15-015    4/28/2015 433.95 272373.65 4840532.66  -74.88    418.86 420.86 2.28
    DLV15-016    5/02/15   287.55 272259    4840653.97  81.65     222.29 224.04 1.75   
    DLV15-019    5/04/15   422.6  272318.9  4840665.76  -28.73    314.45 316.7  2.25   
    DLV15-019-C1 5/11/15   329.3  272318.6  4840665.96  -29.57    315.38 317.41 2.03  
    DLV15-021    5/15/2015 362.9  272244.21 4840825     -37.35    331.7  332.95 1.25  
    DLV15-023    5/28/2015 512.2  272287    4840757     -137.13   414.45 418.68 4.23   
    DLV15-024    6/06/15   388.5  272185.33 4840880.1   2.76      314.82 316.77 1.95   
    DLV15-025    6/06/15   427.1  NO VEIN INTERCEPTED (diked out)

                 Intercept Gold  Silver
                 True      Grade Grade
    Hole_ID      Width (m) (g/t) (g/t)
    DLV15-001    1.18      5.07  270
    DLV15-002    0.23      0.33  72
    DLV15-003    1.49      0.05  2
    DLV15-004    1.88      1.8   151
    DLV15-005    1.13      9.46  1014
    DLV15-007    1.12      5.81  2279
    DLV15-008    1.09      2.57  13
    DLV15-010    4.78      0.65  30
    DLV15-011    0.79      1.24  57
    DLV15-014    0.32      1.33  150
    DLV15-015    1.21      2.58  60
    DLV15-016    1.31      0.44  91
    DLV15-019    1.28      9.36  229
    DLV15-019-C1 1.16      11.88 303
    DLV15-021    0.71      1.38  44
    DLV15-023    2.13      1.14  17
    DLV15-024    1.15      2.2   117

Camila vein 

Table 5: Significant new drill intercepts tentatively correlated with the Camila vein 

   
                                                                                      
              Hole     Hole                          Intercept               Intercept
              Compl.   Total    Intercept Intercept  Elevation From   To     Length   
    Hole_ID   Date     Depth(m) UTM_E     UTM_N      (m)       (m)    (m)    (m)      
    DLV14-058 27/11/14 400.95   272297.48 4840892.26 127.55    193.6  195.1  1.46     
    DLV14-063 7/01/14  250.85   272230.57 4840944.03 67.80     291.5  294.8  3.32    
    DLV15-003 16/03/15 442.95   272297.18 4840900.8  119.1     201.25 202.65 1.40    
    DLV15-008 27/03/15 418.35   272256.32 4840876.6  19.02     299.8  301.4  1.6     
              Intercept
              True      Gold  Silver
              Width     Grade Grade
    Hole_ID   (m)       (g/t) (g/t)
    DLV14-058 0.34      0.30  274
    DLV14-063 0.54      2.80  857
    DLV15-003 0.28      0.05  9
    DLV15-008 0.33      3.05  1078

Yasna vein 

Eight new step-out or infill drill holes on the Yasna vein have only modestly extended the previously defined mineralized zone (Table 6; Figure 7). The mineralized zone currently stands at about 200 m long by 70 m high, down-dip. The latest structural data indicate that the Yasna vein turns and merges with the Kasia vein along strike and probably does not extend all the way south to the Falla Peninsula as an independent fissure.

Table 6: Significant new drill Intercepts tentatively correlated with the Yasna vein  

   
                                                                                       
                 Hole     Hole                         Intercept              Intercept
                 Compl.   Total    Intercept Intercept Elevation From  To     Length   
    Hole_ID      Date     Depth(m) UTM_E     UTM_N     (m)       (m)   (m)    (m)     
    DLV15-006    30/03/15 431.60   271751    4840964.9 108.33    421.7 424.92 3.22     
    DLV15-009    2/04/15  428.95   272028    4840641   27.47     369.7 370.07 0.37     
    DLV15-012    22/04/15 488.60   271778    4840921.3 104.58    443.5 443.75 0.3      
    DLV15-013    11/04/15 389.75   272025    4840624.3 36.66     369   369.33 0.3     
    DLV15-018    14/05/15 446.45   271772    4840966.8 150.44    431.8 432.49 0.67     
    DLV15-018-C1 21/05/15 51.15    271774    4840968.7 146.41    433.9 434.86 0.92    
    DLV15-006-C1 29/05/15 251.00   271752    4840948.3 115.17    418.4 420.32 1.93    
                 Intercept
                 True      Gold  Silver
                 Width     Grade Grade
    Hole_ID      (m)       (g/t) (g/t)
    DLV15-006    2.82      1.61  434
    DLV15-009    0.17      1.42  144
    DLV15-012    0.23      0.3   38
    DLV15-013    0.14      3.16  1134
    DLV15-018    0.54      0.22  81
    DLV15-018-C1 0.75      0.56  161
    DLV15-006-C1 1.5       0.81  262

Irene vein and other 

One new intercept was obtained on the Irene vein and one on a nearby subordinate fissure, confirming that some Ag-Au mineralization persists into the hanging wall of the Falla Laguna Verde between the Delia and the Yasna vein systems (Table 7, Figure 8).

Table 7: Significant new drill intercepts tentatively correlated with the Irene vein. 

   
              Hole                                                                Intercept
              Comp Hole                         Intercept               Intercept True     
              l.   Total    Intercept Intercept Elevation From   To     Length    Width    
    Hole_ID   Date Depth(m) UTM_E     UTM_N     (m)       (m)    (m)    (m)       (m)      
    DLV15-022 -    501.00   271770.7  4840684.1 37.7      279.93 280.65 0.72      0.608    
    OTHERS
    INTERCEPTS
    DLV15-022 -    501.00   271793.7  4840679.6 44.561    298.5  300.2  1.7       1.43
                Gold  Silver
                Grade Grade
    Hole_ID     (g/t) (g/t)
    DLV15-022   1.72  178.5
    OTHERS
    INTERCEPTS
    DLV15-022   2.19  184

Björkdal  

Drilling, Sampling and Assaying 

All the surface, and the majority of the underground diamond drilling has been conducted by third party contractors, producing WL66-sized core (50.5 mm diameter core). During the period from July 31, 2014, to June 30, 2015, 8 diamond core drill holes totaling 935 m were drilled to infill and extend open pit resources; 18 core holes for 4,636 m were drilled to infill and extend underground resources; and 6 core holes totaling 757 m were drilled to test the Rönnberget target. All all diamond drill hole collars are surveyed. Downhole surveys are also carried out to record hole azimuth and dip. Starting in 2013, infill underground diamond drilling programs using WL46-size drill strings (28.8 mm diameter core) were implemented utilizing an in-house drill rig. Due to the nature of the deposit, the core recovery is generally excellent, averaging greater than 90%.

Reverse circulation ("RC") drilling is conducted for infill drilling of open pit resources and is performed as much as possible in the summer months in order to reduce any possible build-up or contamination in the cyclone due to frigid winter conditions. Drilling is performed by contractors utilizing five inch (12.7 cm) diameter drill bits. During the period from July 31, 2014, to June 30, 2015, 30 RC drill holes totaling 886 m were completed. Drill cuttings are sampled every one metre via a cyclone. All RC drill hole collars are surveyed. No downhole surveys are taken because they are not necessary due to the shallow depth of the holes (mostly 32 m).

Diamond core and RC chips are logged by Mandalay personnel on-site. Assaying of Björkdal's samples was completed at ALS Minerals, an independent, ISO accredited laboratory in Piteå, Sweden, CRS Minlab Oy (CRS) in Kempele, Finland, and at the Svartliden gold mine in Sweden. Whole core samples were sent directly to the independent laboratories for sample preparation and assaying. Reverse circulation samples were prepared at the on-site sample preparation facility and then shipped for assaying. Assaying was conducted utilizing the LeachWELL process. QA/QC included the use of standard reference samples, blanks, duplicates, repeats, and internal laboratory quality assurance procedures. More details on the drilling, logging, sampling, and assaying procedures are contained in the Technical Report "Mandalay Resources Corporation Technical Report on the Björkdal Gold Mine, Sweden" filed March 31, 2015.

Drill Results 

Open Pit
New gold-bearing intercepts (both RC and diamond drilling) have demonstrated that high-grade open-pit mineralized extensions are present to all currently mined areas of the pit (Pits 1, 2 and 3; Tables 8, 9; Figure 9). In particular, closely-spaced RC drilling in Pit 2 indicates that significant mineralization exists below the base of the current pit floor and to the far western limits of the pit, suggesting potential for more exploration.

Table 8: Significant new open pit core drill results 

   
                         Total  Intercept Intercept                             True
                Hole     Hole   Easting   Northing  Intercept Drilled           Widt
                Compl.   Length (Mine     (Mine     RL (Mine  Width   Intercept h    Grade
    Hole ID     Date     (m)    Grid)     Grid)     Grid)     (m)     Angle     (m)  (g/t)
    DDP2014-001 9/08/14  250.3  754.016   1012.889  -103.819  1.0                    3.37
                                752.499   981.656   -131.856  1.0                    1.58
    DDP2014-003 1/09/14  63     1561.114  657.404   -94.806   1.0     45        0.66 1.08
                                1551.329  631.645   -118.59   1.0                    0.91
    DDP2014-006 15/09/14 79.2   1572.598  652.494   -115.001  1.0                    0.87
    DDP2014-007 17/09/14 60.9   1717.779  585.065   -134.82   1.0                    5.50
    DDP2014-008 19/09/14 80     1709.643  582.22    -126.53   2.0     42        1.29 2.35
                                1708.85   585.39    -132.034  3.0     45        2.08 44.95
    DDP2014-010 21/09/14 50.1   1686.947  584.393   -125.799  2.0                    0.40
                                1686.48   586.31    -130.933  7.0                    54.97
    DDP2015-001 5/05/15  190.8  2201.393  316.365   -93.952   0.9     14        0.16 45.80
                                2198.585  344.538   -116.09   1.02    45        0.68 1.78
                                2192.429  416.477   -173.36   3.1     51        2.37 0.74
                                2190.998  438.572   -191.105  0.35    52        0.24 3.35
    DDP2015-006 21/05/15 160.39 2049.618  240.83    -116.218  0.3     43        0.16 2.96
                True width is only stated where the orientation of the veins
                intercepted is clear (refer text for information on intersecting
    Note:       vein sets)

Table 9: Significant new open pit RC drill results 

   
                        Total              Intercept Intercept
               Hole     Hole               Easting   Northing               Drilled Au
               Compl.   Lengt Hole Hole    (Mine     (Mine     Intercept RL Width   Grade
    Hole ID    Date     h (m) Dip  Azimuth Grid)     Grid)     (Mine Grid)  (m)     (g/t)
    RC2014-242 13/11/14 32    -40  359.483 936.313   656.162   -52.977      5.0     0.694
                                           936.265   661.524   -57.476      1.0     1.000
                                           936.206   668.035   -62.94       12.0    0.758
                                           936.133   676.078   -69.689      3.0     1.000
    RC2014-243 17/11/14 32    -40  359.858 921.634   655.313   -52.639      6.0     0.838
                                           921.611   664.889   -60.674      1.0     1.000
    RC2014-244 17/11/14 32    -40  0.72    907.057   658.054   -54.761      9.0     0.801
                                           907.226   671.459   -66.01       12.0    0.918
    RC2014-245 17/11/14 24    -40  182.344 906.624   643.01    -56.634      11.0    0.747
    RC2014-246          30    -40  0.431   892.521   659.256   -55.461      4.0     0.755
                                           892.564   665.001   -60.282      3.0     0.670
                                           892.596   669.214   -63.818      2.0     1.000
    RC2014-248 17/11/14 24    -40  179.119 876.314   650.58    -51.26       2.0     6.225
    RC2014-250 19/11/14 24    -40  178.268 861.86    648.948   -53.308      3.0     8.780
    RC2014-251 19/11/14 32    -40  0.343   847.07    659.739   -54.958      1.0     0.420
    RC2014-252 19/11/14 24    -40  182.572 846.831   648.611   -54.342      3.0     63.153
    RC2014-254 20/11/14 24    -40  182.078 830.605   650.494   -52.837      1.0     0.570
    RC2014-255 21/11/14 32    -40  0.893   821.12    675.748   -68.421      1.0     2.630
    RC2014-257 21/11/14 32    -40  359.48  838.805   703.985   -59.753      1.0     6.480
    RC2014-258 21/11/14 32    -40  0.128   853.427   705.531   -58.564      1.0     1.300
    RC2014-259 22/11/14 24    -40  179.565 853.447   688.144   -55.284      1.0     0.530
    RC2014-261 22/11/14 32    -40  1.032   830.893   701.561   -55.505      1.0     0.650
                                           830.935   703.859   -57.433      1.0     0.660
    RC2014-262 1/10/14  32    -40  359.4   809.455   701.779   -61.869      1.0     0.450
    RC2014-263 1/12/14  32    -40  358.768 794.868   698.865   -52.369      1.0     1.070
    RC2014-265 2/12/14  32    -40  0.789   809.887   674.05    -64.518      1.0     0.800
    RC2014-267 2/12/14  32    -40  359.204 794.974   662.485   -50.838      1.0     0.490
                                           794.953   664.017   -52.124      1.0     3.100
                                           794.846   671.677   -58.552      3.0     6.083
    RC2014-268 2/12/14  24    -40  180.624 794.987   659.771   -51.243      1.0     1.580
    RC2014-270 3/12/14  32    -40  1.351   763.043   693.579   -59.986      1.0     1.440
    RC2014-272 4/12/14  24    -40  181.719 747.751   690.472   -53.382      2.0     1.015
    RC2014-273 4/12/14  32    -40  359.727 795.043   741.005   -57.483      5.0     7.164
                                           795.021   745.602   -61.34       1.0     0.740
                                           795.01    747.9     -63.268      1.0     0.470
                                           794.975   755.177   -69.375      2.0     54.450
    RC2014-274 4/12/14  32    -40  1.635   795.334   723.93    -57.659      1.0     1.620
    RC2014-275 5/12/14  32    -40  359.592 778.842   727.909   -59.569      1.0     0.820
                                           778.79    735.187   -65.676      2.0     0.555
    RC2014-276 5/12/14  32    -40  358.832 778.544   749.484   -60.617      1.0     0.760
    RC2014-278 5/12/14  32    -40  359.538 748.117   725.294   -57.614      4.0     1.855
                                           748.068   731.422   -62.756      6.0     6.393
    RC2014-280 6/12/14  24    -40  179.752 741.124   690.547   -62.817      1.0     0.490
    RC2014-281 6/12/14  32    -40  0.741   733.455   723.936   -59.446      2.0     1.530
                                           733.499   727.383   -62.339      1.0     0.430
    RC2014-282 8/12/14  32    -40  1.869   742.146   756.647   -68.03       8.0     3.219

Underground 

Table 10: Significant new underground core drill intercepts 

   
                         Total  Intercept Intercept                             True
                Hole     Hole   Easting   Northing  Intercept Drilled           widt Gold
                Compl.   Length (Mine     (Mine     RL (Mine  Width   Intercept h    Grade
    Hole ID     Date     (m)    Grid)     Grid)     Grid)     (m)     Angle     (m)  (g/t)
    DDU2014-018 9/10/14  329.1  1060.02   1269.536  -265.601  1.00                   3.51
                                1077.493  1238.825  -256.45   2.00                   19.96
    DDU2014-019 20/10/14 332.3  1065.278  1259.168  -267.623  2.00                   3.24
    DDU2014-020 2/11/14  299.5  1647.686  1522.67   -430.075  1.00                   5.24
                                1579.789  1627.303  -498.979  1.00                   138.50
    DDU2014-021 11/11/14 300.7  1782.144  1286.338  -349.878  13.50                  5.28
                                1805.113  1238.775  -346.15   4.60                   20.44
                                1816.055  1215.496  -344.151  1.00                   4.54
    DDU2014-024 6/12/14  301.2  1219.185  1088.864  -213.702  3.00                   1.48
                                1215.018  1078.388  -210.22   3.00                   2.24
                                1208.491  1062.22   -204.914  2.05                   3.24
    DDU2014-025 12/12/14 203.2  1268.147  1107.576  -216.372  3.20                   1.24
                                1308.984  1035.162  -186.923  6.00                   8.39
                                1317.188  1021.782  -181.516  2.40                   2.45
                                1322.741  1012.626  -177.829  6.25                   1.76
                                1326.772  1005.814  -175.094  3.00                   1.92
    DDU2015-002 20/01/15 302.5  1088.649  1095.74   -231.54   0.20    40        0.08 24.30
    DDU2015-004 12/02/15 299.8  1082.563  1510.302  -358.003  0.25    75        0.22 300.00
                                1077.028  1519.813  -361.827  2.05    60        1.74 1.74
                                1054.981  1557.212  -376.803  0.70    50        0.49 10.55
                                1044.014  1575.673  -384.166  0.90    30        0.39 7.59
                                1023.623  1609.752  -397.756  1.55    50        1.15 13.67
    DDU2015-005 22/02/15 299.8  1072.512  1610.767  -399.197  4.80                   1.22
                                1066.427  1621.835  -403.519  2.50    59        2.11 3.45
                                1041.585  1667.042  -420.798  0.40                   13.05
                                1027.244  1693.315  -430.531  3.25                   73.37
    DDU2015-006 6/03/15  296.55 1274.891  1577.131  -400.275  0.80    52        0.59 5.01
                                1260.021  1602.518  -409.634  2.05                   19.16
                                1200.648  1703.247  -445.146  0.95    10        0.17 4.59
    DDU2015-007 11/03/15 302.7  1421.849  1556.087  -389.979  3.40                   6.70
                                1403.268  1589.976  -403.129  0.55    50        0.38 7.62
                                1387.382  1619.84   -414.382  1.45                   56.97
                                1355.12   1683.154  -437.169  1.60    24        0.59 6.59
                                1352.197  1689.011  -439.186  1.50    47        1.05 2.79
    DDU2015-008 19/03/15 254    1742.286  1327.466  -354.943  1.55    69        1.42 5.72
                                1769.492  1277.924  -355.416  3.00                   5.19
                                1797.189  1226.397  -355.027  3.80    70        3.55 3.12
    DDU2015-009 25/03/15 224.7  1760.353  1319.92   -356.626  4.40    72        4.16 1.48
                                1777.083  1306.21   -358.009  12.75                  1.46
                                1787.185  1297.798  -358.883  3.20    32        1.64 3.93
    DDU2015-010 29/03/15 180    1237.512  1125.146  -226.163  0.55    22        0.38 10.94
                                1261.426  1085.832  -211.735  0.60    52        0.43 9.99
                                1276.373  1060.702  -202.217  7.90    79        0.76 1.30
    DDU2015-011 2/04/15  186.6  1326.844  1139.585  -223.528  16.00                  8.83
                                1335.779  1122.423  -219.694  0.45    48        0.29 11.96
                                1369.264  1054.401  -205.857  0.30    61        0.23 14.86
    DDU2015-012 6/04/15  182.8  1323.938  1120.075  -218.766  2.45    62        2.13 4.12
                                1324.536  1101.289  -214.384  0.35                   396.81
    DDU2015-013 9/04/15  175.8  1331.163  1119.899  -218.944  0.60                   7.24
                                1335.689  1104.043  -215.357  0.25    82        0.24 130.78
                                1347.118  1062.138  -205.8    1.10    68        1.00 33.49
    DDU2015-014 12/04/15 164.8  1343.926  1109.338  -218.246  0.25    80        0.23 21.73

Several new underground intercepts have demonstrated that economic mineralization occurs along strike from the existing Main, Central and Lake zones, while new across-strike vein systems containing high-grade gold intercepts have been discovered immediately north of the currently defined Lake Zone area. As such, the current extent of mineralization in the underground environment remains open to the north, east and west. Drilling in these areas will be infilled to build the underground Indicated and Inferred resource inventories.

Table 11: Significant new results from the detailed underground test drilling program 

   
                                     Hole
                         Total Hole  Azimu Intercept Intercept
                Hole     Hole  Dip   th    Easting   Northing  Intercept Drilled          
                Compl.   Lengt (Mine (Mine (Mine     (Mine     RL (Mine  Width   Intercept
    Hole ID     Date     h (m) Grid) Grid) Grid)     Grid)     Grid)     (m)     Angle    
    DDT2015-001 20/01/15 104.9 -5.5  149.7 1981.101  923.449   -335.912  1.00    40
    DDT2015-002 22/01/15 110.6 -17.5 149.7 1980.167  927.032   -349.02   2.53    64       
                                           1986.16   916.834   -352.673  1.77    62       
    DDT2015-003 24/01/15 90.1  -30.9 150.1 1947.262  982.96    -331.137  2.56    40       
                                           1964.933  952.656   -352.339  1.42    15       
    DDT2015-004 30/01/15 107.7 -7.3  149.9 1968.648  906.077   -336.74   8.28    45       
    DDT2015-005 2/02/15  109.3 -17.6 149.6 1927.798  976.701   -326.742  0.56    20      
    DDT2015-006 4/02/15  92.4  -29.6 149.6 1927.533  977.142   -326.151  0.52    37      
                                           1946.207  945.216   -348.24   16.66
    DDT2015-007 6/02/15  104   -6.7  150.5 1983.961  958.527   -332.689  2.47    80       
                                           1992.099  944.414   -334.741  3.75    55      
    DDT2015-008 10/02/15 109.8 -17.6 150.5 1969.723  983.504   -332.19   1.00    35      
                                           1993.168  942.521   -347.333  4.31    73      
                                           1999.896  930.865   -351.671  0.23            
    DDT2015-009 13/02/15 95.4  -30.4 150.7 1983.05   959.52    -353.237  1.34    50      
                                           1992.224  943.055   -364.457  0.77           
    DDT2015-010 16/02/15 107.7 -7.8  150.8 2005.681  961.945   -334.096  0.20    37      
    DDT2015-011 17/02/15 110.5 -16.9 150.8 1996.262  978.875   -336.532  0.55    65      
                                           2020.645  934.266   -352.546  0.21    78      
    DDT2015-012 19/02/15 91    -31.2 151.0 2001.991  968.146   -352.816  10.83           
                                           2004.1    964.27    -355.52   0.48    46      
                 Intercept Gold
                 True      Grade
    Hole ID      width (m) (g/t)
    DDT2015-001  0.59      4.39
    DDT2015-002  2.25      3.04
                 1.53      5.04
    DDT2015-003  0.6       1.35
                 0.31      12.56
    DDT2015-004  5.81      4.96
    DDT2015-005  0.13      17.54
    DDT2015-006  0.26      173.50
                           1.58
    DDT2015-007  2.42      1.91
                 3.03      1.82
    DDT2015-008  0.52      4.45
                 4.1       1.65
                           23.16
    DDT2015-009  0.98      14.43
                           4.83
    DDT2015-010  0.07      31.14
    DDT2015-011  0.47      18.52
                 0.19      22.98
    DDT2015-012            3.98
                 0.35      38.7

The Test Drilling Program (DDT diamond drilling program) has used oriented drill core to successfully identify mineralized veins of several different orientations within the Main Zone of the mine. These veins strike at an oblique angle to the dominant vein direction and commonly contain higher than average gold grades. The use of oriented, closely-spaced drilling has allowed for a detailed understanding of a geologically complex area within the mine.

District Targets- Rönnberget 

The Rönnberget prospect lies some 5 km due-east from the current open-pit operations. Drilling intercepts from 2014, previously unreleased, indicate that high grades exist in albite-altered rock units (with associated veinlets) over a strike length of at least 100 m (Table 12; Figure 11). While the geological setting of the area remains ambiguous, these drilling results indicate that there is substantial scope for future exploration at Rönnberget.

Table 12: Significant intercepts from Rönnberget core drilling 

   
                Hole Compl. Total Hole Intercept Easting Intercept Northing Intercept RL

    Hole ID     Date        Length (m) (Mine Grid)       (Mine Grid)        (Mine Grid) 
    DDP2014-001 9/08/14     250.3      754.016           1012.889           -103.819    
                                       752.499           981.656            -131.856    
    DDP2014-003 1/09/14     63         1561.114          657.404            -94.806    
                                       1551.329          631.645            -118.59    
    DDP2014-006 15/09/14    79.2       1572.598          652.494            -115.001    
    DDP2014-007 17/09/14    60.9       1717.779          585.065            -134.82     
    DDP2014-008 19/09/14    80         1709.643          582.22             -126.53     
                                       1708.85           585.39             -132.034    
    DDP2014-010 21/09/14    50.1       1686.947          584.393            -125.799   
                                       1686.48           586.31             -130.933   
    DDP2015-001 5/05/15     190.8      2201.393          316.365            -93.952    
                Drilled Width Intercept True Width Grade (g/t)

    Hole ID     (m)           Angle     (m)        Au
    DDP2014-001 1.0                                3.37
                1.0                                1.58
    DDP2014-003 1.0           45        0.66       1.08
                1.0                                0.91
    DDP2014-006 1.0                                0.87
    DDP2014-007 1.0                                5.50
    DDP2014-008 2.0           42        1.29       2.35
                3.0           45        2.08       44.95
    DDP2014-010 2.0                                0.40
                7.0                                54.97
    DDP2015-001 0.9           14        0.16       45.80

Challacollo 

  • At the Challacollo Ag-Au project in northern Chile:
    • The Mineral Resource is unchanged since publication in March, 2015.
    • Mine design, metallurgy, plant design, infrastructure design is complete.
    • Identification of suitable water supply remains pending.
    • EIS application is awaiting resolution of the water supply.

The feasibility study for Challacollo development is nearly complete.

  • In Q1, 2015 Mandalay published an updated 43-101 Technical Report for Challacollo, including a new resource estimate incorporating results of the 2014 diamond-drilling program.

Table - 13 The estimated mineral resource for the Challacollo deposit 

   
    Classification  M Tonnes Ag g/t Au g/t Contained Ag (Moz) Contained Au (koz)
    Indicated       4.7      200    0.32   30.2               48.4
    Inferred        1.6      134    0.31   6.9                15.9

Notes: 

   
    1. Mineral Resources estimated as of 31 December, 2014
    2. Mineral Resources stated according to CIM guidelines
       Mineral Resources are estimated at a cut-off grade of 60 g/t Ag as interpreted and
    3. modelled using Geovia Surpac software
       A density 2.45 g/cmcubed is used as a base density with adjustments according to
    4. the variation of the estimated barium, lead and zinc grades
       No capping of Ag grades has been applied due to low-grade variability. Au grades
       have been capped at 3 g/t for two sample composites 4.57 g/t Au and 4.11 g/t Au
    5. respectively.

Work completed to date by consultants on design of the underground mine, processing plant, tailing storage and project infrastructure has been advanced sufficiently for preparation of the Environmental Impact Study application (EIS). The development option being evaluated for Challacollo consists of the following components:

  • Underground mine with ramp access for longhole open stoping to produce 1,800 tpd mill feed;
  • Processing plant with 3-stage crushing, single-stage milling, agitated cyanide leach circuit, Merrill Crowe plant to produce a silver-gold doré and tailing filtration to recover water and cyanide;
  • The extensive metallurgical testing program confirmed cyanidation as the most appropriate method and silver recovery to doré of 93%;
  • Dry stack tailing storage facility;
  • On-site infrastructure support facilities, to include camp accommodation for up to 250 people during the operating phase;
  • Electrical power supply via connection to the SING grid;
  • New site access road (15 km)

However, while the study has confirmed that water supply of 12 litres/second is required for the operation, as of June 30, 2015, a suitable source of water has yet to be developed. Alternatives being evaluated include a well field on the property and off-site water sources.

Data collection and the compilation of results of surveys required to develop the environmental baseline continues and estimating of project impacts for the EIA has commenced. Baseline parameters under investigation include; flora, fauna, ground and surface water quality, air quality, meteorology, archaeology and social / community.

Stakeholder identification for Challacollo is complete. The active community engagement phase, designed to communicate the Company´s plans and elicit community feedback, is underway. Company and project presentations have been made to seven stakeholder groups and guided site visits by interested parties are being conducted.

Mandalay has decided to postpone submitting its EIS permit application until a suitable water source has been identified. This will avoid having to permit the water source itself in a second application.

While it develops the alternatives for sourcing water, Mandalay has options to conduct another round of exploration drilling to increase Mineral Resources and to optimize plant design, capital cost, and operating cost estimates to improve planned financial outcomes.

Qualified Persons:  

Costerfield: Chris Gregory, Vice President of Operational Geology and Chief Shield Geologist, is a Member of the Australian Institute of Geoscientists (AIG), and a Qualified Person as defined by NI 43-101. He has reviewed and approved the technical and scientific information about Costerfield contained in this release.

Cerro Bayo: Scott Manske, Chief Cordilleran Geologist of Mandalay Resources, is an Oregon registered Professional Geologist. A "Qualified Person" as defined by NI 43-101, he has reviewed and approved the technical and scientific information on Challacollo contained in this release.

Björkdal : Chris Gregory, Vice President of Operational Geology and Chief Shield Geologist, is a Member of the Australian Institute of Geoscientists (AIG), and a Qualified Person as defined by NI 43-101. He has reviewed and approved the technical and scientific information about Björkdal contained in this release.

Challacollo: Scott Manske, Chief Cordilleran Geologist of Mandalay Resources, is an Oregon registered Professional Geologist. A "Qualified Person" as defined by NI 43-101, he has reviewed and approved the technical and scientific information on Challacollo contained in this release.

About Mandalay Resources Corporation:
Mandalay is a Canadian-based natural resource company with producing assets in Australia, Chile and Sweden and a development project in Chile. The Company is focused on executing a roll-up strategy, creating critical mass by aggregating advanced or in-production gold, copper, silver and antimony projects in Australia, the Americas, and Europe to generate near-term cash flow and shareholder value.

Forward-Looking Statements:
This news release contains "forward-looking statements" within the meaning of applicable securities laws, including statements regarding the Company's Mineral Resources, Mineral Reserves (including anticipated increases of each), ongoing exploration plans and goals. Readers are cautioned not to place undue reliance on forward-looking statements. Actual results and developments may differ materially from those contemplated by these statements depending on, among other things, changes in commodity prices and general market and economic conditions. The factors identified above are not intended to represent a complete list of the factors that could affect Mandalay. A description of additional risks that could result in actual results and developments differing from those contemplated by forward-looking statements in this news release can be found under the heading "Risk Factors" in Mandalay's annual information form dated March 31, 2015, a copy of which is available under Mandalay's profile at http://www.sedar.com. In addition, there can be no assurance that any current or future Inferred Resources that are discovered as a result of additional drilling will ever be upgraded to Proven or Probable Reserves. Although Mandalay has attempted to identify important factors that could cause actual actions, events or results to differ materially from those described in forward-looking statements, there may be other factors that cause actions, events or results not to be as anticipated, estimated or intended. There can be no assurance that forward-looking statements will prove to be accurate, as actual results and future events could differ materially from those anticipated in such statements. Accordingly, readers should not place undue reliance on forward-looking statements.

Bradford Mills, Chief Executive Officer; Greg DiTomaso, Investor Relations, Contact: +1-647-260-1566

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