Minera Camargo

Exploring the Sierra Madre of Mexico for gold and base metals.

Porphyry copper and molybdenum

Stockworks, dissemination and breccias of chalcopyrite and molybdenite-rich mineralization are associated with a Paleocene granitic complex in the western part of the Property. Accessory tin, tungsten, bismuth, gold and silver also occur in this style of mineralization.

Porphyry systems are defined as large volumes (10 to more than 100 cubic kilometers) of hydrothermally altered rock centered on one or more intrusive rocktypes. Principal economic parts of porphyry systems typically take the form of an inverted cup or trough above their causative intrusions. Level plans of the economic portion of porphyry systems typically show radial mineral and metal zoning from (i) a silicic core, (ii) a potassic ore zone of quartz, potassium feldspar, magnetite, biotite, chalcopyrite, bornite and molybdenite with economic grades of copper, molybdenum and other metals, (iii) phyllic alteration dominated by pyrite, sericite and muscovite, and (iv) distal propylitic alteration with epidote and chlorite. Horizontal dimensions of the silicic through the phyllic zones range from a few hundred meters to 5 or 6 kilometers across. Vertical extent of the economic mineralization is usually less tham 1500 m.

Copper and molybdenum stockworks related to porphyritic intrusions at Picachos have not been explored with either geophysics or diamond drilling. Geochemical results mentioned below are from hand trenching and surface sampling.   

Alteration Map of the Picachos Property. The northwestern part of the Property is dominated by sericitic alteration assemblages. The southeastern part of the Property is mainly altered to propylitic and argillic mineral assemblages
Image of sample BRG-26926_26928 from 0.9 to 1.4 m, Chinakatera Adit Level 734 m ('Cobre' on the above map). This sample contains 124 g/t silver, 4 % copper, 7 ppm molybdenum, 97 ppm bismuth and 26 ppm tungsten across 0.5 m. Mineralization is in a 'C-type' potassic-sericitic vein with white mica in the vein selvedge. Host rocks to this mineralization are ignimbrites correlated to the Socavon Volcanics and orbicular monzonite porphyry.
Log of Trench BRG-50250 from the Colina copper prospect. Copper is mainly in chalcocite that coats pyrite disseminated in an apophysis of alkali granite porphyry. The margin of this porphyry is strongly mineralized. Between 18 and 19 meters, values of 694 g/t silver, 30 ppm molybdenum, 138 ppm tungsten, 0.2% bismuth and 0.5% lead occur in a potassic-sericitic vein localized by the edge of this porphyritic intrusion.
Image of sample WSR-175 from the Molly prospect with values of >2000 ppm molybdenum and 113 ppm copper across 5 meters.