Local Geology, Mineralization & Ore Types
|La Guitarra Production Results
|Ore Processed/Tonnes Milled
|Average Silver Grade (g/tonne)
|Total Silver Ounces Produced
|Gold Ounces Produced
|Total Production - Ounces Silver Equivalent
|Underground Development (m)
|Diamond Drilling (m)
La Guitarra is situated in the southern part of the Sierra Madre Occidental. The region is characterized by mafic volcanics of the Trans-Mexican belt superimposing the intermediate to felsic Eocene volcanics. The mine also hosts rocks from Mesozoic schist and slates to Tertiary age volcanics and intrusives. The area was mineralized due to the late Miocene volcanic disruptions.
The core of the district is a mineralized belt over 15 km long and at least 4 km wide, containing hundreds of documented epithermal veins. Mineralization is hosted in these vein type ore bodies in the form of quartz-monzonite compositions. Ag-Au mineralization is the product of a large low-sulfidation hydrothermal system. Ore grade mineralization is structurally controlled, and varies in size from narrow high-grade veins to bulk tonnage zones ranging up to 70 metres in width.
Reserves & Resources
First Majestic Silver Corp. as of March 31, 2015 filed a new La Guitarra NI 43-101, for more detailed geological information, readers are encouraged to review the company's most recent NI 43-101 Report.
The Reserves/Resources inventories are reported in NI 43-101 Technical Reports published periodically by the Company. The complete report can be viewed in the Reserves/Resources section or on SEDAR.