Sierra Madre Gold & Silver (SM CN) has provided an update, detailing progress in its expansion from 500tpd throughput capacity to 750-800tpd at La Guitarra. This is the first phase of a larger expansion which will take capacity to 1,200-1,500tpd by Q3 2027. The expansion of the crushing circuit, with a new cone crusher and additional conveyor feeds, is now being tested. Further crushing capability may be added at the front end to optimise recoveries. A used ball mill has been purchased which i ....