Stretching for 1,300 km in longitude and 100 to 300 km in width, the Sierra Madre del Sur mining region of Mexico has a complex geologic history. Within this complexity many types of ore deposits have formed, some of which have shown economic viability.
Of the deposit types with published resources skarns are the most conspicuous, due to the successful exploration effort that culminated with the definition of several millions of ounces of gold in the recently discovered and developed Guerrero Gold Belt. Other deposit types with resources include Low sulfidation epithermal veins, Low sulfidation epithermal deposits in disseminations, breccias and stockworks, Intermediate sulfidation in veins, Intermediate sulfidation epithermal deposits in disseminations, breccias and stockworks, Volcanogenic massive sulfides (VMS) and Porphyry copper deposits.
There are also at least two deposit types that are known to exist in this region without producing yet a resource calculation: Orogenic gold and High sulfidation epithermal deposits. There are several known properties of both styles ranging from Chiapas to Michoacan, so our guess is that it is just a matter of time before some resources are defined in these styles of deposits.
The image below is a slide from a presentation on the Sierra Madre del Sur, depicting the number of deposits of each style in the region with published resources.