| Company | Sierra Madre |
| Date | 2022 |
| Region | Temascaltepec, México |
| Commodities | Silver, Gold |
| Mine Type | Underground |
| Throughput | 400 tpd (operating), 500 tpd (capacity) |
| Status | Care and Maintenance |
Executive Summary
This technical report details the recovery methods and processing plant status for the La Guitarra Silver Mine, operated by Sierra Madre. The property is currently under care and maintenance and not producing. The existing processing plant is a flotation facility designed to produce silver and gold ore concentrate.
The plant was last operated at approximately 400 tonnes per day (tpd), with a stated capacity of 500 tpd when all ball mills are functional. The crushing circuit utilizes a primary jaw crusher in closed circuit with a cone crusher. Grinding is performed using four ball mills in parallel, though one has been non-operational since 2016.
Flotation involves multiple cell sizes arranged in rougher, scavenger, and cleaner configurations. Concentrate dewatering utilizes thickener, filter presses, and a rotary kiln for drying. Significant maintenance items, including chute liners and flotation cell reconfiguration, were identified as necessary before plant restart.
Website: https://sierramadregoldandsilver.com/project/la-guitarra-project
Report Date: 2022
Region: Temascaltepec, México
Project Status: Care and Maintenance
Commodity: Silver, Gold
Throughput: 400 tpd (operating), 500 tpd (capacity)
Mine Life:
Mine Type: Underground
Ore type:
Technical report and processing history
The following archived source profiles have been consolidated here to preserve the project’s processing history and study context.
La Guitarra Silver Mine — NI 43-101 Technical Report
La Guitarra Silver Mine — NI 43-101 Technical Report
| Company | First Majestic |
| Mine | La Guitarra Silver Mine |
| Date | Unknown |
| Region | Temascaltepec, Edo. Mexico, Mexico |
| Commodities | Silver, Gold |
| Mine Type | Underground |
| Throughput | 520 tpd |
| Status | Operating |
Executive Summary
The La Guitarra Silver Mine utilizes a flotation processing method to recover silver and gold-bearing minerals. The plant has an installed capacity of 520 tonnes per day and processes ore through a two-stage crushing circuit followed by ball mill grinding. The ground ore undergoes bulk flotation to produce a concentrate, which is then thickened and filtered before shipment.
The processing flowsheet includes primary jaw crushing and secondary cone crushing to reduce ROM material to minus 3/8 inches. Four independent ball mill circuits grind the ore to a P80 of 115 µm. Flotation consists of primary rougher, scavenger, and cleaner stages using Wemco cells. Final concentrates are thickened and filtered to approximately 10% humidity for transport to the port of Manzanillo.
Tailings are pumped to an impoundment 1.3 km away, with 92% of plant water requirements met through recycled water from the tailings and concentrate thickening processes.
Website: https://www.firstmajestic.com/investors/news-releases/first-majestic-announces-closing-sale-of-la-guitarra-to-sierra-madre
Report Date: Unknown
Region: Temascaltepec, Edo. Mexico, Mexico
Project Status: Operating
Commodity: Silver, Gold
Throughput: 520 tpd
Mine Life:
Mine Type: Underground
Ore type:
