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mineralization and were an indication to early miners of high grades of ore (Wandke and

Martinez, 1928). The stockworks are present in the hanging wall of the main vein and can

have stope dimensions of more than 200 m x 100 m (Wandke and Martinez, 1928)


Sample Collection and Preparation

Working in collaboration with the staff of Great Panther Resources, a total of 855

samples were collected along a 4 km strike length of the Veta Madre from both surface

outcrops (Fig. 5, top) and underground locations, including drill core (Fig 5, bottom). The

accessibility of underground workings in the San Vicente, Cata, Valenciana, Rayas and

Guanajuatito Mines offered good three dimensional geological controls. The northern

part of Valenciana Mine was not accessible because this area was flooded and access was

prohibited. Collection of samples from surface outcrops and underground and drill cores

focused on samples that contained transparent minerals that could be examined for fluid

inclusions, especially quartz and calcite.

Surface samples were collected at each location where vein material was

encountered outcropping on the surface (Fig. 5, top). One 400 m traverse perpendicular to

the Veta Madre in the vicinity of the San Vicente Mine was also conducted, collecting

samples of quartz and/or calcite veins that were encountered along the traverse. In the

underground mines, samples were collected at regular intervals along drifts. Sample

locations were determined using mine maps and survey marks. Samples were collected

from the hanging wall and footwall of the vein where access permitted. Underground

areas sampled included the following mines: Rayas Mine (345 and 390 levels), Cata


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