The Martha epithermal Au-Ag deposit contains multiple
generations of quartz veins with a range of textures. We
examined:

vein
textures,

crosscutting vein relationships,
and

the paragenetic sequence within
the pit walls as well as a wide range of hand specimens.
Samples include host rock, breccia, and veins, but these
groups are not distinct; instead, they form a continuum.

Veins at Martha mine show a wide range of textures on a
local scale; these textures also change significantly over both the lateral and
vertical extent of the pit. Common textures include crustiform bands, comb
quartz, colloform bands, platy quartz, massive
quartz, drusy quartz, sedimentary textures and brecciation.

Vein grades relate to textures. Many textures, including
crustiform, platy, cherty, and sedimentary textures display predominantly low
grades, but some textures are linked with high grades, such as ginguro, massive
and comb quartz where they are associated with visible base metal sulphides
and/or electrum. Host rocks and most breccias
are low grade, as most samples contain <2 ppm au.>