Overview
| Stage | Permitting |
| Mine Type | Open Pit |
| Commodities |
|
| Mining Method |
|
| Mine Life | 5 years (as of Jan 1, 2018) |
The La Fortuna open pit gold project has a robust and positive preliminary economic assessment (PEA) completed and the main Federal permits in hand. |
Source:
p. 30, 33
| Company | Interest | Ownership |
|
Minera Alamos Inc.
|
100 %
|
Indirect
|
|
Minera Alamos de Sonora, S.A. de C.V.
|
100 %
|
Direct
|
On 4 May 2016, Minera Alamos acquired 100% of four mining concessions comprising the La
Fortuna Project from Argonaut Gold Inc. (Argonaut) and its wholly-owned Mexican subsidiary, Durango Fern Mines S.A. de C.V.
The Qualified Person has relied entirely upon Minera Alamos, its management and legal counsel for information related to documentation pertaining to the ownership of the concessions and the updated status of the La Fortuna I/II/III/V concessions subsequent to the June 2017 title opinion.
Contractors
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Deposit Type
- Intrusion related
- Breccia pipe / Stockwork
- Porphyry
- Epithermal
Summary:
Known mineralization within the La Fortuna Project area is spatially associated with calc-alkaline intrusions, with different zones exhibiting a combination of geological characteristics and gold-silver grades of both porphyry and epithermal mineralization styles. Collectively the zones at La Fortuna may be best characterized as intrusion- related ‘transitional’ deposits. They consist mainly of a hydrothermally altered breccia “pipe”, tabular in shape, similar in nature to other quartz-sulphide gold ± copper ± silver epithermal breccia deposits.
The Project area hosts numerous historic adits, and gold-silver showings including the historic La Fortuna Mine (and extensions) and the Ramada, PN, and Cerro Pelon zones to name a few.
Mineralization in the La Fortuna Mine area appears to be spatially associated with a series of parallel fault structures (approximately 1.5–2 km apart) and related to tourmalinized quartz monzonite breccia bodies which are located along the periphery or flanks of a north-northwest striking, west dipping, tabular quartz monzonite intrusive that appears to be approximately 60 m wide and forms a prominent topographic ridge prominent in the mine area. These fault structures and tourmaline breccia bodies have been the source of significant historical mining activity within the Project area.
La Fortuna Mine
The La Fortuna deposit is hosted within a tabular mineralized body that is up to 60 m thick and dips 30 ........
Summary:
Mineralization at La Fortuna extends close to surface and is amenable to conventional open pit methods utilizing front-end loaders and trucks. Pit bench heights are assumed to be 5 m in order to provide good ore/waste selectivity, although the use of larger bench heights in zones consisting predominantly of waste should be considered as part of future optimization studies.
Overall average pit slopes with the benches/ramps in place are approximately 43° for three sides and 41° overall for the north wall. Rock competency is reasonable and higher pit slopes may be considered once the appropriate geotechnical information is available.
Mineralized and waste material will be hauled using 25-t trucks approximately 500 m (maximum) to the mineralized stockpile and waste dump locations near the mine. Crushed stockpile material is then transported to the plant processing facilities located at a distance of less than 1.5 km from the mine.
Flow Sheet:
Flow Sheet:
Summary:
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Projected Production:
| Commodity | Product | Units | Avg. Annual | LOM |
|
Gold
|
Concentrate
|
kt
| | 0.7 |
|
Gold
|
Metal in concentrate
|
koz
| 43 | 213 |
|
Silver
|
Metal in concentrate
|
oz
| ...... | ...... |
|
Copper
|
Metal in concentrate
|
t
| ...... | ...... |
|
Copper
|
Concentrate
|
kt
| | ...... |
|
Gold Equivalent
|
Metal in concentrate
|
oz
| ...... | |
Operational Metrics:
| Metrics | |
|
Tonnes milled
| 1,998,356 t * |
|
Waste tonnes, LOM
| 12,863,948 t * |
|
Ore tonnes mined, LOM
| 2,867,303 t * |
|
Total tonnes mined, LOM
| 15,731,200 t * |
|
Daily processing rate
| 1,100 t * |
|
Mining scale, tpd
| 9,000 t |
|
Processing scale, tpd
| 1,100 t |
* According to 2018 study.
Reserves at December 20, 2018:
| Category | Tonnage | Commodity | Grade | Contained Metal |
|
Measured
|
1,755,375 t
|
Gold
|
2.96 g/t
|
167,000 oz
|
|
Measured
|
1,755,375 t
|
Silver
|
17.5 g/t
|
987,800 oz
|
|
Measured
|
1,755,375 t
|
Copper
|
0.23 %
|
4,000 t
|
|
Indicated
|
1,714,336 t
|
Gold
|
2.59 g/t
|
142,800 oz
|
|
Indicated
|
1,714,336 t
|
Silver
|
15.5 g/t
|
854,400 oz
|
|
Indicated
|
1,714,336 t
|
Copper
|
0.21 %
|
3,600 t
|
|
Measured & Indicated
|
3,469,711 t
|
Gold
|
2.78 g/t
|
309,800 oz
|
|
Measured & Indicated
|
3,469,711 t
|
Silver
|
16.51 g/t
|
1,842,200 oz
|
|
Measured & Indicated
|
3,469,711 t
|
Copper
|
0.22 %
|
7,600 t
|
|
Inferred
|
156,322 t
|
Gold
|
1.72 g/t
|
8,600 oz
|
|
Inferred
|
156,322 t
|
Silver
|
8.51 g/t
|
42,700 oz
|
|
Inferred
|
156,322 t
|
Copper
|
0.09 %
|
100 t
|
Corporate Filings & Presentations:
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