Overview
Status | Care and Maintenance |
Mine Type | Underground |
Commodities |
|
Mining Method |
- Shrinkage stoping
- Longhole stoping
|
Production Start | ... |
The Rosario Project was placed on care and maintenance in August 2021. This decision was made following an extensive review by management of the Rosario Mine operations and strategic options available including the potential sale of the operation.
Certain assets related to the Rosario Project were sold in December 2021 as part of a tax restructuring of Impulsora Minera Santacruz, S.A. de C.V. |
Source:
p. 32
Rosario Mine is owned by Santacruz Silver Mining.
Contractors
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Deposit Type
- Vein / narrow vein
- Mesothermal
Summary:
Mineralization is hosted in two veins with a general strike of N60W, dipping between 45 to 60 degrees southwest. The host rock of the veins is comprised of the Zacatecas formation, a mid to late Triassic turbidite sequence, consisting of beds of dark grey, green and grayish-green shale, sandstone, conglomerate and siltstone. The veins extend over a length of 2.5 to 3.0 kilometers, and to a depth of at least 150 to 200 meters, as determined from available drilling data (Rodriguez et al., 1987). Each of the Rosario I and Rosario II veins vary in width from 0.4 to 2.5 meters. Mineralization appears to have occurred in three stages, with the third stage precipitating the silver bearing minerals. This deposit has been described as a mesothermal vein system based on temperature (195 to 338°C), although mineralization is typical of other deposits in Mexico which are described as epithermal. Abundant sulfides, sphalerite pyrite and galena with subordinate amounts of chalcopyrite, arsenopyrite and hematite, can be found within the veins. Additional minerals identified through electron microscopy include freibergite, tetrahedrite, boulangerite, pyrargyrite, argentite, stromeyerite, and diaphorite (Rodriguez et al., 1987).
The Rosario Veins at the Rosario Project are vein filled faults defined as mesothermal within epithermal limits.
Based on fluid inclusion work in quartz and calcite, Palacios and Arriaga (1994) postulated that the mineralization in the Rosario ........
Mining Methods
- Shrinkage stoping
- Longhole stoping
Summary:
The Rosario Project currently includes the Rosario Mine and the Membrillo Prospect. The Company suspended operations at the Cinco Estrellas property in late 2017.
At the Membrillo Prospect the Company completed access to Levels 1, 2 and 3 on the main Membrillo vein as well as on the San Rafael vein.
Current primary source of mill feed is the Membrillo Prospect, a mesothermal, low sulphidation polymetallic vein system of Ag, Au, Zn and Pb that carries to surface.
Management remains focussed on increasing tonnes of mineralized material processed at the milling facility with the objective of reaching 400 tpd before the end of Q3 2020 with improved head grades. Additional mining equipment (two sccoptrams) was procured for the project in the second quarter of 2020 which should result in an increase of production towards the target amount.
Management is continuing to seek cost savings measures and on the technical side has changed to horizontal mining on the veins from previously mining the veins vertically with a view to realizing better dilution control.
Source:
Summary:
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Pipelines and Water Supply
Source:
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Production:
In October 2021, Santacruz Silver Mining ceased operations at the Rosario Mine and placed it on care and maintenance.
Commodity | Units | 2021 | 2020 | 2019 | 2018 | 2017 | 2016 | 2015 |
Silver
|
oz
| ...... | ...... | ...... | 74,981 | 112,663 | 425,838 | 471,893 |
Gold
|
oz
| ...... | ...... | ...... | ...... | ...... | ...... | ...... |
Lead
|
t
| ...... | ...... | ...... | ...... | ...... | ...... | ...... |
Zinc
|
t
| ...... | ...... | ...... | ...... | ...... | ...... | ...... |
Silver Equivalent
|
oz
| ...... | ...... | ...... | ...... | ...... | ...... | ...... |
All production numbers are expressed as metal in concentrate.
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Operational Metrics:
Metrics | 2021 | 2020 | 2019 | 2018 | 2017 | 2016 | 2015 |
Tonnes milled
| ...... | ...... | 76,088 t | 61,184 t | 78,963 t | 91,852 t | 79,249 t |
Daily milling rate
| ...... | ...... | | | | | |
Daily milling capacity
| ...... | ...... | 500 t | | | | |
Reserves at December 1, 2012:
The decision to commence production at the Rosario Mine and Membrillo Prospect were not based on a feasibility study with mineral reserves demonstrating economic and technical viability. Accordingly, there is increased uncertainty and economic and technical risks of failure associated with this decision. Production and economic variables may vary considerably due to the absence of a complete and detailed site analysis according to and in accordance with NI 43-101.
Category | Tonnage | Commodity | Grade | Contained Metal |
Measured
|
270 kt
|
Silver
|
210.1 g/t
|
1,825 koz
|
Measured
|
270 kt
|
Gold
|
0.94 g/t
|
8,162 oz
|
Measured
|
270 kt
|
Lead
|
1.17 %
|
6,952 k lbs
|
Measured
|
270 kt
|
Zinc
|
3.69 %
|
21,997 k lbs
|
Measured
|
270 kt
|
Silver Equivalent
|
381 g/t
|
3,306 koz
|
Indicated
|
711 kt
|
Silver
|
162.7 g/t
|
3,718 koz
|
Indicated
|
711 kt
|
Gold
|
0.882 g/t
|
20,159 oz
|
Indicated
|
711 kt
|
Lead
|
1.18 %
|
18,430 k lbs
|
Indicated
|
711 kt
|
Zinc
|
2.6 %
|
40,690 k lbs
|
Indicated
|
711 kt
|
Silver Equivalent
|
303 g/t
|
6,931 koz
|
Measured & Indicated
|
981 kt
|
Silver
|
175.7 g/t
|
5,543 koz
|
Measured & Indicated
|
981 kt
|
Gold
|
0.898 g/t
|
28,320 oz
|
Measured & Indicated
|
981 kt
|
Lead
|
1.17 %
|
25,383 k lbs
|
Measured & Indicated
|
981 kt
|
Zinc
|
2.9 %
|
62,687 k lbs
|
Measured & Indicated
|
981 kt
|
Silver Equivalent
|
325 g/t
|
10,236 koz
|
Inferred
|
386 kt
|
Silver
|
90.6 g/t
|
1,126 koz
|
Inferred
|
386 kt
|
Gold
|
0.81 g/t
|
10,053 oz
|
Inferred
|
386 kt
|
Lead
|
0.73 %
|
6,206 k lbs
|
Inferred
|
386 kt
|
Zinc
|
2.1 %
|
17,874 k lbs
|
Inferred
|
386 kt
|
Silver Equivalent
|
203 g/t
|
2,523 koz
|
Commodity Production Costs:
| Commodity | Units | 2021 | 2020 | 2019 | 2018 | 2017 |
Cash costs (sold)
|
Silver Equivalent
|
USD
|
......
|
......
|
......
|
34.3 / oz
|
21.8 / oz
|
All-in sustaining costs (sold)
|
Silver Equivalent
|
USD
|
......
|
......
|
......
|
39.4 / oz
|
26 / oz
|
Operating Costs:
| Units | 2021 | 2020 | 2019 | 2018 | 2017 | 2016 |
Total operating costs ($/t milled)
|
USD
| 75.1 | 72.3 | 75.3 | 93.6 | 72.4 | 81.2 |
Financials:
| Units | 2020 | 2019 | 2018 | 2017 |
Revenue
|
M USD
| ...... |
......
|
2.3
|
4.2
|
Gross profit
|
M USD
| ...... |
......
|
-4.6
|
-3.2
|
Operating Income
|
M USD
| ...... |
......
|
-6.1
|
-18
|
Pre-tax Income
|
M USD
| ...... |
......
|
-6.1
|
-18
|
Mine Management:
Job Title | Name | Phone | Ref. Date |
.......................
|
.......................
|
...........
|
Aug 10, 2023
|
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