MOZ New Mineral Resource Estimate
ORIGINAL: Marathon Increases Overall Gold Resources to 2,137,400 ounces M&I at 1.99 g/t gold and 1,104,700 ounces Inferred at 1.99 g/t gold at the Valentine Lake Gold Camp, Newfoundland
2018-05-01 09:23 ET - News Release
TORONTO, May 01, 2018 (GLOBE NEWSWIRE) -- Marathon Gold Corporation (“Marathon” or the “Company”) (MOZ:TSX) has established a new Mineral Resource Estimate for the Marathon Deposit at its 100% owned Valentine Lake Property prepared under the direction of John T. Boyd Company in accordance with National Instrument 43-101 (“NI 43-101”). The resources were revised as part of the soon to be released Preliminary Economic Assessment (PEA). All the gains came from the Marathon Deposit which was updated as of March 5, 2018.
Highlights of the Marathon Deposit Resource Update:
- The Valentine Lake Gold Camp hosts a multimillion ounce gold resource that continues to expand with the addition of new data
- The drill fire assay results received and metallic screen assays after November 27, 2017 up until March 2, 2018 were added to the new resource
- Many of these new holes were deeper and as a result there is an increase in the grade and an increase in the ounces for the underground resource with the largest increase in underground inferred to 471,500 oz at grade of 3.35 g/t Au
- More drilling is required to define the underground potential of the Marathon Deposit
- There was a small decrease in the open pit resources of the Leprechaun and Victory Deposits from use of PEA level open pit design
- Sprite was not included in the PEA study because the pits were too small and require more drilling
- The bog drilling is demonstrating good potential for potential open pit mining.
“The Marathon Deposit still continues to deliver promising results as it is now double the size of the Leprechaun Deposit and remains open to further expansion. The increase in grade and size of the underground material at Marathon is very important for future resource development as is the Sprite drilling in the bog area. There is an opportunity for resource expansion in both open pit and underground available for Marathon to test before the next economic study.” said Phillip Walford, President and CEO of Marathon.
Valentine Lake Gold Camp Resource Table
| Material/Category | Open Pit | Underground | Total |
| Tonnes | Grade | Gold | Tonnes | Grade | Gold | Tonnes | Grade | Gold |
| (kt) | (g/t) | (oz) | (kt) | (g/t) | (oz) | (kt) | (g/t) | (oz) |
| Leprechaun Deposit | | | | | | | | | |
| Measured - Mill | 2,270,000 | 4.543 | 331,600 | 234,000 | 5.276 | 39,700 | 2,504,000 | 4.611 | 371,300 |
| Measured - Heap Leach | 2,656,000 | 0.550 | 47,000 | 0 | 0.000 | 0 | 2,656,000 | 0.550 | 47,000 |
| Indicated - Mill | 1,297,000 | 3.633 | 151,500 | 224,000 | 4.649 | 33,500 | 1,521,000 | 3.783 | 185,000 |
| Indicated - Heap Leach | 1,664,000 | 0.549 | 29,400 | 0 | 0.000 | 0 | 1,664,000 | 0.549 | 29,400 |
| Total Measured & Indicated | 7,887,000 | 2.206 | 559,500 | 458,000 | 4.969 | 73,200 | 8,345,000 | 2.358 | 632,700 |
| Inferred - Mill | 1,875,000 | 3.114 | 187,700 | 705,000 | 4.544 | 106,700 | 2,580,000 | 3.505 | 294,400 |
| Inferred - Heap Leach | 3,841,000 | 0.521 | 64,300 | 0 | 0.000 | 213,400 | 3,841,000 | 0.521 | 277,700 |
| Total Inferred | 5,716,000 | 1.372 | 252,000 | 705,000 | 4.544 | 320,100 | 6,421,000 | 1.720 | 572,100 |
| Sprite Deposit |
| Measured - Mill | 0 | 0.000 | 0 | 0 | 0.000 | 0 | 0 | 0.000 | 0 |
| Measured - Heap Leach | 0 | 0.000 | 0 | 0 | 0.000 | 0 | 0 | 0.000 | 0 |
| Indicated - Mill | 160,000 | 3.422 | 17,600 | 74,000 | 4.534 | 10,800 | 234,000 | 3.773 | 28,400 |
| Indicated - Heap Leach | 170,000 | 0.572 | 3,100 | 0 | 0.000 | 0 | 170,000 | 0.572 | 3,100 |
| Total Measured & Indicated | 330,000 | 1.954 | 20,700 | 74,000 | 4.534 | 10,800 | 404,000 | 2.426 | 31,500 |
| Inferred - Mill | 268,000 | 2.718 | 23,400 | 74,000 | 4.534 | 21,600 | 342,000 | 3.111 | 45,000 |
| Inferred - Heap Leach | 586,000 | 0.539 | 10,200 | 0 | 0.000 | 43,200 | 586,000 | 0.539 | 53,400 |
| Total Inferred | 854,000 | 1.223 | 33,600 | 74,000 | 4.534 | 64,800 | 928,000 | 1.487 | 98,400 |
| Marathon Deposit |
| Measured - Mill | 4,770,000 | 2.942 | 451,100 | 534,000 | 4.769 | 81,900 | 5,304,000 | 3.126 | 533,000 |
| Measured - Heap Leach | 3,428,000 | 0.479 | 52,800 | 0 | 0.000 | 0 | 3,428,000 | 0.479 | 52,800 |
| Indicated - Mill | 7,510,000 | 2.305 | 556,600 | 1,573,000 | 3.823 | 193,300 | 9,083,000 | 2.568 | 749,900 |
| Indicated - Heap Leach | 5,847,000 | 0.479 | 90,000 | 0 | 0.000 | 0 | 5,847,000 | 0.479 | 90,000 |
| Total Measured & Indicated | 21,555,000 | 1.660 | 1,150,500 | 2,107,000 | 4.063 | 275,200 | 23,662,000 | 1.874 | 1,425,700 |
| Inferred - Mill | 2,047,000 | 1.934 | 127,300 | 4,366,000 | 3.359 | 471,400 | 6,413,000 | 2.904 | 598,700 |
| Inferred - Heap Leach | 1,838,000 | 0.479 | 28,300 | 0 | 0.000 | 0 | 1,838,000 | 0.479 | 28,300 |
| Total Inferred | 3,885,000 | 1.246 | 155,600 | 4,366,000 | 3.359 | 471,400 | 8,251,000 | 2.364 | 627,000 |
| Victory Deposit |
| Measured - Mill | 0 | 0.000 | 0 | 0 | 0.000 | 0 | 0 | 0.000 | 0 |
| Measured - Heap Leach | 0 | 0.000 | 0 | 0 | 0.000 | 0 | 0 | 0.000 | 0 |
| Indicated - Mill | 570,000 | 2.235 | 41,000 | 5,000 | 3.714 | 600 | 575,000 | 2.248 | 41,600 |
| Indicated - Heap Leach | 377,000 | 0.489 | 5,900 | 0 | 0.000 | 0 | 377,000 | 0.489 | 5,900 |
| Total Measured & Indicated | 947,000 | 1.540 | 46,900 | 5,000 | 3.714 | 600 | 952,000 | 1.552 | 47,500 |
| Inferred - Mill | 782,000 | 1.796 | 45,200 | 221,000 | 3.152 | 22,400 | 1,003,000 | 2.095 | 67,600 |
| Inferred - Heap Leach | 671,000 | 0.500 | 10,800 | 0 | 0.000 | 0 | 671,000 | 0.500 | 10,800 |
| Total Inferred | 1,453,000 | 1.198 | 56,000 | 221,000 | 3.152 | 22,400 | 1,674,000 | 1.456 | 78,400 |
| All Deposits |
| Measured - Mill | 7,040,000 | 3.458 | 782,700 | 768,000 | 4.924 | 121,600 | 7,808,000 | 3.602 | 904,300 |
| Measured - Heap Leach | 6,084,000 | 0.510 | 99,800 | 0 | 0.000 | 0 | 6,084,000 | 0.510 | 99,800 |
| Indicated - Mill | 9,537,000 | 2.500 | 766,700 | 1,876,000 | 3.950 | 238,200 | 11,413,000 | 2.739 | 1,004,900 |
| Indicated - Heap Leach | 8,058,000 | 0.496 | 128,400 | 0 | 0.000 | 0 | 8,058,000 | 0.496 | 128,400 |
| Total Measured & Indicated | 30,719,000 | 1.800 | 1,777,600 | 2,644,000 | 4.233 | 359,800 | 33,363,000 | 1.993 | 2,137,400 |
| Inferred - Mill | 4,972,000 | 2.400 | 383,600 | 5,366,000 | 3.522 | 607,600 | 10,338,000 | 2.982 | 991,200 |
| Inferred - Heap Leach | 6,936,000 | 0.509 | 113,500 | 0 | 0.000 | 0 | 6,936,000 | 0.509 | 113,500 |
| Total Inferred | 11,908,000 | 1.299 | 497,100 | 5,366,000 | 3.522 | 607,600 | 17,274,000 | 1.989 | 1,104,700 |
| | | | | | | | | | |
Notes:
- The effective date for this mineral resource estimate for Leprechaun, Sprite, and Victory is November 27, 2017 and is reported on a 100% ownership basis. The effective date for the mineral resource estimate for Marathon is March 5, 2018. The resources have been restated using the updated PEA economics. All material tonnes and gold values are undiluted.
- Mineral Resources are calculated at a gold price of US$1,250 per troy ounce.
- The open pit mineral resources presented above uses a PEA level open pit design. The underground mineral resources are that material outside of the in-pit mineral resources above the stated underground cut-off grade.
- Mineral resources which are not mineral reserves do not have demonstrated economic viability. The estimate of mineral resources may be materially affected by environmental, permitting, legal, title, socio-political, marketing, or other relevant issues.
- The mineral resources presented here were estimated using a block model with a block size of 6 m by 6 m by 6 m sub-blocked to a minimum block size of 2 m by 2 m by 2 m using ID3 methods for grade estimation. Mineral resources for the Leprechaun and Sprite deposits are reported using an open pit gold cut-off of 0.267 g/t Au and an underground gold cut-off of 1.840 g/t Au. Material between a 0.267 Au g/t value and 1.055 Au g/t is assumed to be processed on a heap leach. Material above a 1.055 Au g/t is assumed to be processed in a mill. Higher gold grades were given a limited area of influence and was applied during grade estimation by mineralized domain. Mineral resources for the Marathon deposit are reported using an open pit gold cut-off of 0.312 g/t Au and an underground gold cut-off of 1.619 g/t Au. Material between a 0.312 Au g/t value and 0.707 Au g/t is assumed to be processed on a heap leach. Material above a 0.707 Au g/t is assumed to be processed in a mill. Higher gold grades were given a limited area of influence and was applied during grade estimation by mineralized domain. Mineral resources for the Victory deposit are reported using an open pit gold cut-off of 0.328 g/t Au and an underground gold cut-off of 1.803 g/t Au. Material between a 0.328 Au g/t value and 0.707 Au g/t is assumed to be processed on a heap leach. Material above a 0.707 Au g/t is assumed to be processed in a mill. Higher gold grades were given a limited area of influence and was applied during grade estimation by mineralized domain.
- The mineral resources presented here were estimated using the Canadian Institute of Mining, Metallurgy and Petroleum (CIM), CIM Standards on Mineral Resources and Reserves, Definitions and Guidelines prepared by the CIM Standing Committee on Reserve Definitions and adopted by CIM Council May 10, 2014.
- Figures are rounded and totals may not add correctly.
Acknowledgments
Marathon acknowledges the financial support of the Junior Exploration Assistance Program, Department of Natural Resources, Government of Newfoundland and Labrador.
Qualified Persons
The Valentine Lake Property is under the direct supervision of Ms. Sherry Dunsworth, P.Geo., Senior Vice President of Exploration for Marathon Gold Corporation. Ms. Sherry Dunsworth is defined as a Qualified Person as defined by the National Instrument 43-101. Robert J. Farmer, P. Eng. of John T. Boyd Company is responsible for the completion of the resource update and is an independent Qualified Person as defined by the National Instrument 43-101.
Quality Assurance-Quality Control (“QA/QC”)
Thorough QA/QC protocols are followed on the project including the insertion of blanks and standard samples in all drill holes. The core is cut in half and one half retained at site, the other half is tagged and bagged and sent directly to Eastern Analytical Ltd. In Springdale, Newfoundland. Eastern Analytical prepares the samples and
uses fire assay with an atomic absorption finish to determine the gold content. All samples above 0.10 grams per tonne in economically interesting intervals are further assayed using metallic screen to mitigate the presence of coarse gold.
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