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Mexico
San Francisco Mine

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 Location:
142 km N from Hermosillo, Sonora, Mexico

  Regional Office:
Blvd. Paseo de las Quintas 123, local 101
Hermosillo
Sonora, Mexico
CP 83247
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  • Overview
  • Owners
  • Geology
  • Mining
  • Processing
  • Production
  • Reserves
  • Costs & Financials
  • Fleet
  • Personnel
  • Filings & News

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Overview

StageProduction
Mine TypeOpen Pit
Commodities
  • Gold
  • Silver
Mining Method
  • Truck & Shovel / Loader
Production Start...
Mine Life2028
Magna operates one open-pit heap leach operating mine: the San Francisco Mine in the state of Sonora, Mexico. The San Francisco Mine was in residual leaching when it was acquired on May 6, 2020. The mining and crushing activities restarted late in June 2020. During June 2021, the San Francisco Mine completed planned pre-stripping activities and began full-scale and steady rate commercial production.


Owners

Source: p. 7,11
CompanyInterestOwnership
Magna Gold Corp. 100 % Indirect
Magna Gold Corp. holds a 99.9% interest in Minera Magna. Minera Magna holds a 99.9% interest in Molimentales.

Molimentales owns a 100% interest in the San Francisco Project and the surrounding mineral concessions.

Contractors

Subscription required - Subscription is required.


Deposit Type

  • Vein / narrow vein
  • Orogenic
  • Mesothermal


Summary:

PROPERTY GEOLOGY
The San Francisco property lies in a portion of the Mojave-Sonora megashear belt characterized by the presence of Precambrian to Tertiary age rocks represented by different grades of deformation and metamorphism as evidenced in the field by imbricate tectonic laminates. The rocks principally involved in the process of deformation and associated with the gold mineralization in the region are of Precambrian, Jurassic and Cretaceous age.

The metamorphic rocks are intruded by a Tertiary igneous package, which includes leucocratic granite with visible feldspar and quartz, and is porphyritic to gneissic in texture. It appears that the granite was emplaced along low angle northwest-southeast shear zones in the system which developed between an older gabbro and the metamorphic sequence. This is the reason that in some places the granite bodies appear as stratiform lenses that vary in width from centimetres to more than 40 m and are subparallel to the foliation. It is seen, however, that the emplacement of leucocratic granite also favours the N30°W fault system, causing the granite to take an elongated form, principally in direction N60°W, but with extensions along the N30°W system.

MINERALIZATION
The San Francisco property is located within the Sierra Madre Occidental metallogenic province which extends along western Mexico from the state of Sonora, south to the state of Jalisco. In the state of Sonora, the most import ........


Mining Methods

  • Truck & Shovel / Loader


Summary:

Mining at the San Francisco and La Chicharra pits is conducted by a contractor, using open pit mining methods. At the San Francisco pit, a small underground mine was exploited during the second half of 2020 in order to accelerate cash flow by targeting some higher-grade mineralization in the block model.

Magna has now started to process ore from the low-grade stockpiles as well from the La Chicharra pit and plans to initiate underground mining from the higher grade lenses in the southwall of the San Francisco pit, as well as resuming open pit mining in portions of the San Francisco pit.

Magna will also establish its own stockpile for the lower grade material (but above the cut-off grade) being mined. This lower grade material can be processed later in the mine life, used to top up the crushing capacity from time to time or left to be processed at the end of the mine life.

Mine Plans and Activities
Production from the La Chicharra deposit recommenced in June, 2020. The San Francisco and La Chicharra pits are planned to be mined at the same time. Magna is also processing the remainder of Alio’s low-grade stockpile. The La Chicharra pit is located 1,000 m west of the San Francisco pit.

All mining activities are being conducted by the contractor, Peal Mexico, S.A. de C.V. (Peal Mexico), of Navojoa, Mexico. The contractor is obliged to supply and maintain the appropriate principal and auxiliary mining equipment and personnel requ ........


Crushing and Grinding
Source: Subscription required

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Processing

Flow Sheet: Subscription required

Summary:

- subscription is required.


Production:
Production statistics for the 2020 year are calculated and provided by the two companies - Alio gold inc.(old owner) and Magna Gold Corp.(new owner).

CommodityUnits2021202020192018201720162015
Gold oz  ......  Subscription required  ......  Subscription required  ......  Subscription required53,99083,558100,32293,353
Silver oz  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required
All production numbers are expressed as metal in doré.
Subscription required - Subscription is required.

Operational Metrics:

Metrics202120202019201820172016
Total tonnes mined  ......  Subscription required23,318 kt25,956 kt22,353,870 t
Ore tonnes mined  ......  Subscription required6,046 kt6,997 kt7,457,484 t
Waste  ......  Subscription required15,510 kt18,960 kt14,896,386 t
Stripping / waste ratio  ......  Subscription required  ......  Subscription required1.99 2.71 2
Daily mining rate  ......  Subscription required  ......  Subscription required63,887 t71,113 t61,076 t
Tonnes processed  ......  Subscription required  ......  Subscription required6,155 kt6,511 kt7,537 kt7,652,642 t
Daily processing rate  ......  Subscription required  ......  Subscription required16,864 t17,839 t20,649 t20,909 t
Subscription required - Subscription is required.

Reserves at August 8, 2020:
Mineral Resource Estimate for the San Francisco Deposit with Cut-off (Au g/t) 0.14 for Open pit and 1.40 for Underground and for La Chicharra Deposits Cut-off (Au g/t) 0.12.

CategoryOreTypeTonnage CommodityGradeContained Metal
Proven Stockpiles 782 kt Gold 0.256 g/t 6 koz
Proven In-Situ (OP) 20,967 kt Gold 0.495 g/t 334 koz
Proven In-Situ (UG) 91 kt Gold 4.186 g/t 12 koz
Proven Total 21,840 kt Gold 0.501 g/t 352 koz
Probable In-Situ (OP) 25,769 kt Gold 0.488 g/t 404 koz
Probable In-Situ (UG) 20 kt Gold 3.657 g/t 2 koz
Probable Total 25,789 kt Gold 0.49 g/t 406 koz
Proven & Probable Stockpiles 782 kt Gold 0.256 g/t 6 koz
Proven & Probable In-Situ (OP) 46,736 kt Gold 0.491 g/t 738 koz
Proven & Probable In-Situ (UG) 111 kt Gold 4.089 g/t 15 koz
Proven & Probable Total 47,629 kt Gold 0.495 g/t 758 koz
Measured In-Situ (OP) 34,564 kt Gold 0.449 g/t 500 koz
Measured In-Situ (UG) 111 kt Gold 4.16 g/t 15 koz
Measured Total 34,675 kt Gold 0.462 g/t 515 koz
Indicated In-Situ (OP) 64,789 kt Gold 0.424 g/t 884 koz
Indicated In-Situ (UG) 236 kt Gold 3.907 g/t 30 koz
Indicated Total 65,025 kt Gold 0.437 g/t 914 koz
Measured & Indicated In-Situ (OP) 99,353 kt Gold 0.433 g/t 1,385 koz
Measured & Indicated In-Situ (UG) 347 kt Gold 3.988 g/t 44 koz
Measured & Indicated Total 99,700 kt Gold 0.446 g/t 1,430 koz
Inferred In-Situ (OP) 11,374 kt Gold 0.467 g/t 171 koz

Commodity Production Costs:

CommodityUnits202120202019201820172016
Credits (by-product) Gold USD  ......  Subscription required  ......  Subscription required -8 / oz   -10 / oz  
Cash costs (sold) Gold USD  ......  Subscription required  ......  Subscription required 839 / oz   744 / oz  
Cash costs (sold) Gold USD  ......  Subscription required†  ......  Subscription required†  ......  Subscription required† 1,042 / oz†   831 / oz†   734 / oz†  
All-in sustaining costs (sold) Gold USD  ......  Subscription required†  ......  Subscription required†  ......  Subscription required† 1,258 / oz†   1,034 / oz†   853 / oz†  
† Net of By-Product.
Subscription required - Subscription is required.

Operating Costs:

Units20212020201920182017
OP mining costs ($/t mined) USD 2.252.571.142.022
Processing costs ($/t milled) USD  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required
Total operating costs ($/t milled) USD  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required
Subscription required - Subscription is required.

Financials:

Units202120202019201820172016
Capital expenditures M USD  ......  Subscription required  ......  Subscription required  ......  Subscription required 11.3   20.9   5.6  
Sustaining costs M USD 8.7   4.3  
Revenue M USD  ......  Subscription required  ......  Subscription required  ......  Subscription required 67.2   105.2   123.9  
Operating Income M USD  ......  Subscription required  ......  Subscription required  ......  Subscription required -10.5   28.7   56.5  
Pre-tax Income M USD  ......  Subscription required  ......  Subscription required
After-tax Income M USD  ......  Subscription required  ......  Subscription required
EBIT M USD
Operating Cash Flow M USD 13.1   34.1  
Subscription required - Subscription is required



Heavy Mobile Equipment as of October 31, 2018:
HME TypeModelQuantityLeased or
Contractor
Dozer ....................... Subscription required ....................... Subscription required Leased
Dozer ....................... Subscription required ....................... Subscription required Leased
Dozer ....................... Subscription required ....................... Subscription required Leased
Drill ....................... Subscription required ....................... Subscription required Leased
Drill ....................... Subscription required ....................... Subscription required Leased
Grader ....................... Subscription required ....................... Subscription required Leased
Loader ....................... Subscription required ....................... Subscription required Leased
Loader ....................... Subscription required ....................... Subscription required Leased
Shovel ....................... Subscription required ....................... Subscription required Leased
Truck (haul) ....................... Subscription required ....................... Subscription required Leased
Truck (haul) ....................... Subscription required ....................... Subscription required Leased
Truck (haul) ....................... Subscription required ....................... Subscription required Leased
Truck (haul) ....................... Subscription required ....................... Subscription required Leased
Subscription required - Subscription is required.

Mine Management:

Job TitleNameProfileRef. Date
....................... Subscription required ....................... Subscription required Subscription required Aug 4, 2022
....................... Subscription required ....................... Subscription required Subscription required Aug 4, 2022
....................... Subscription required ....................... Subscription required Subscription required Aug 31, 2022
Subscription required - Subscription is required.

Staff:

EmployeesContractorsTotal WorkforceYear
Subscription required 2019
Subscription required Subscription required 2018
Subscription required Subscription required 2017
Subscription required Subscription required 2016

Corporate Filings & Presentations:

DocumentYear
................................... Subscription required 2021
................................... Subscription required 2021
................................... Subscription required 2021
................................... Subscription required 2021
................................... Subscription required 2020
................................... Subscription required 2020
................................... Subscription required 2020
................................... Subscription required 2020
................................... Subscription required 2020
................................... Subscription required 2020
................................... Subscription required 2020
................................... Subscription required 2020
................................... Subscription required 2019
................................... Subscription required 2019
................................... Subscription required 2019
Annual Information Form 2018
Corporate Presentation 2018
Financial Review 2018
Management Discussion & Analysis 2018
Press Release 2018
Annual Information Form 2017
Corporate Presentation 2017
Financial Review 2017
Management Discussion & Analysis 2017
Press Release 2017
Technical Report 2017
Annual Information Form 2016
Financial Review 2016
Form 40-F 2016
Management Discussion & Analysis 2016
Form 40-F 2015
Technical Report 2015
Technical Report 2013
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