Osisko Development

Highlights

Click for more detailed map

Location
Sonora, Mexico

Ownership
100%

Mine Type
Open Pit

Land Package
11,338 ha of mineral rights

Metals
Gold, Silver

Project Status
Awaiting next steps from the Mexican government on permitting

Overview

The San Antonio Gold Project is a past-producing oxide copper mine located in the state of Sonora, Mexico. In 2020, following acquisition of this project, the Company concentrated its efforts in obtaining the required permits and amendments to the permits to perform its activities. In Q1 2022, Sapuchi Minera commenced processing stockpile inventory through sodium cyanide heap leach pads and carbon-in-column processing plant. The Company realized its first gold sales in July 2022 and generated gold sales totalling 10,478 net ounces in 2022. In Q3 2023, processing of the remaining stockpile inventory was completed, and no production is anticipated henceforth. A total of 13,591 ounces of gold was sold from the San Antonio heap leach pad as at September 30, 2023.

On June 30, 2022, the Company announced an initial open pit mineral resource estimate (“MRE”) for the San Antonio Project. The 2022 MRE covers a portion of the Sapuchi – Cero Verde trend that encompasses five deposits: Sapuchi, Golfo de Oro, California, Calvario and High Life over approximately 2.8 km along strike, a maximum width of 600 metres (m) to a maximum depth of 300 m below surface.

The deposits are constrained within a geologic model of the hydrothermal breccia, the main mineralization control known to date. Additional drill targets remain underexplored on the property and new exploration drilling is recommended to verify historic data and potentially add new resource. Further infill and exploration drilling is recommended on the Project.

Mineral Reserves & Resources

San Antonio Mineral Resources Estimate (June 24, 2022)

Information relating to San Antonio is supported by the technical report titled "NI 43-101 Technical Report for the 2022 Mineral Resource Estimate on the San Antonio Project, Sonora, Mexico", dated July 12, 2022 (with an effective date of June 24, 2022) prepared for the Company by independent representatives of Micon International Limited (the "San Antonio Technical Report", collectively with the Trixie Technical Report and Cariboo Technical Report, the "Technical Reports"). Reference should be made to the full text of the San Antonio Technical Report, which was prepared in accordance with National Instrument 43-101 – Standards of Disclosure for Mineral Projects ("NI 43-101").

Indicated Resources

Deposit	Weathering Zone	Tonnes (Mt)	Au (g/t)	Ag (g/t)	Au Ounces (000)	Ag Ounces (000,000)
California	Oxide	0.6	0.93	2.8	17	0.05
	Transition	0.2	0.79	3.3	6	0.02
	Sulphide	3.1	1.31	2.4	130	0.23
	Total	3.9	1.22	2.5	153	0.30
Golfo de Oro	Oxide	0.2	1.07	2.8	7	0.02
	Transition	0.1	1.19	2.8	6	0.01
	Sulphide	5.3	1.46	2.5	249	0.42
	Total	5.6	1.44	2.5	262	0.45
Sapuchi	Oxide	1.9	0.85	3.6	53	0.22
	Transition	1.4	1.04	3.6	47	0.16
	Sulphide	2.1	0.94	3.4	62	0.22
	Total	5.4	0.93	3.5	162	0.60
Total	Oxide	2.7	0.89	3.4	77	0.29
	Transition	1.7	1.02	3.5	59	0.19
	Sulphide	10.5	1.31	2.6	441	0.87
	Total	15.0	1.20	2.9	577	1.38

Inferred

Deposit	Weathering Zone	Tonnes (Mt)	Au (g/t)	Ag (g/t)	Au Ounces (000)	Ag Ounces (000,000)
California	Oxide	0.4	0.68	2.1	8	0.02
	Transition	0.1	0.85	2.6	4	0.01
	Sulphide	1.1	1.27	3.8	46	0.14
	Total	1.6	1.10	3.3	58	0.17
Golfo de Oro	Oxide	0.5	0.80	3.0	12	0.04
	Transition	0.2	0.93	3.4	5	0.02
	Sulphide	5.7	1.29	2.5	237	0.46
	Total	6.4	1.24	2.5	254	0.52
High Life	Oxide	0.5	0.84	4.2	14	0.07
	Transition	0.2	0.73	4.5	4	0.02
	Sulphide	0.1	0.90	8.3	4	0.04
	Total	0.8	0.83	4.9	22	0.13
Sapuchi	Oxide	3.2	0.74	3.7	75	0.37
	Transition	1.6	0.92	3.6	48	0.19
	Sulphide	2.8	0.92	4.1	84	0.37
	Total	7.6	0.85	3.8	207	0.93
Calvario	Oxide	0.1	0.53	0.0	2	0.00
	Transition	0.0	0.55	0.0	0.0	0.00
	Sulphide	0.0	0.0	0.0	0.0	0.00
	Total	0.1	0.53	0.0	2	0.00
Total	Oxide	4.7	0.74	3.5	111	0.50
	Transition	2.1	0.90	3.6	61	0.24
	Sulphide	9.7	1.18	3.2	371	1.01
	Total	16.5	1.02	3.3	543	1.75

View Notes [+]

Rodrigo Calles-Montijo, of Servicios Geológicos IMEx, S.C., William J. Lewis and Alan J San Martin, of Micon International Limited have reviewed and validated the mineral resource estimate for Sapuchi, Golfo de Oro, California, High Life and Calvario deposits. All are independent “Qualified Persons” (as defined in NI 43-101) responsible for the 2022 MRE Sapuchi. The effective date of the MRE Sapuchi is June 24th, 2022.
Specific extraction methods are used only to establish reasonable cut-off grades for various portions of the deposit. No Preliminary Economic Analysis, Pre-Feasibility Study or Feasibility Study has been completed to support economic viability and technical feasibility of exploiting any portion of the mineral resource, by any particular mining method.
The mineral resources disclosed were estimated using the Canadian Institute of Mining, Metallurgy and Petroleum (“CIM”) standards on mineral resources and reserves definitions, and guidelines prepared by the CIM standing committee on reserve definitions and adopted by the CIM council.
The calculated economic cut-off grade for the resource in: Oxides (70% recovery) is 0.27 g/t Au, transition and sulphides (90% recovery) is 0.44 g/t Au
Mineral resources are not mineral reserves and do not have demonstrated economic viability.
Geologic modeling was completed by Osisko Development. The MRE Sapuchi was completed by Geologist Leonardo Souza, MAusIMM (CP) of Talisker Exploration Services, under the supervision of Rodrigo Calles-Montijo, of Servicios Geológicos IMEx, S.C., William J.Lewis and Alan J. San Martin, of Micon International Limited
The estimate is reported for a potential open pit scenario and with USD assumptions. The cut-off grades were calculated using a gold price of $1,750 per ounce, a CAD:USD exchange rate of 1.3; mining cost of $2.95/t; processing cost of $4/t for oxides and $13.0/t for transition and sulphides; and general and administration costs of $2.50/t. The cut-off grades should be re-evaluated in light of future prevailing market conditions (metal prices, exchange rate, mining cost, etc.).
A density of 2.55 g/cm3 was established for all oxide zones, 2.69 g/cm3 for transition zones and 2.74g/cm3 for the sulphide zones.
Resources for Sapuchi, Golfo de Oro, California, High Life and Calvario were estimated using Datamine Studio RM 1.3 software using hard boundaries on composited assays (3.0 m for all zones). Ordinary Kriging interpolation method was used in a with a parent block size = 10m x 10m x 5m.
Results are presented in-situ. Ounce (troy) = metric tons x grade / 31.10348. Calculations used metric units (metres, tonnes, g/t). The number of metric tons was rounded to the nearest thousand. Any discrepancies in the totals are due to rounding effects; rounding followed the recommendations as per NI 43-101.

Gallery

Technical Reports

NI 43-101 Technical Report2022 Mineral Resource Estimate on the San Antonio Project – Sonora, Mexico June 24, 2022