5[per thousand]) than the plutonic suite: rhyolite-andesite and dacite
This is particularly interesting because unpublished information for an archaeolgical site that has no associated dacite
bedrock indicates that the dacite
came from the largest bedrock source site at Cache Creek--transported hundreds of kilometres some 2,000 to 6,000 years ago
No cross-cutting relationships were observed between the hornblende dacite
La partie superieure de la Formation de Porten Road comporte une sequence interstratifree de rhyolite riche en quartz et de dacite
pauvre en quartz provenant vraisemblablement de la fusion de Ia croute continentale.
The Ingalls Head Formation consists of grey to purple tuff, minor andesite to dacite
flows, and grey to purple mudstone and sandstone.
Towards the base of the antimony zone, vein densities increase and the volcaniclastic andesite is intruded by dacite
breccia with a narrow zone of gold mineralization from -395 to -405 feet.
The geologically-modelled strike extensions of both the C-1 and C-2 vein systems are covered by a 10-30m thick blanket of dacite
tuff both to the east and west of the previously-drilled outcropping vein segments;
The volcanic country rock is composed of andesite with lesser rhyolite and dacite
flows and dikes.
The area is characterized by post-mineral colluvium and gravel cover that obscures the underlying bedrock, but occurs immediately west of, and on the margins of, a small hill where a dacite
These vein systems occur within a vitreous rhyolite - dacite
volcanic unit which has been altered and exhibits quartz-carbonate stockwork throughout the areas occupied by the veins.
The mineralized body is defined as a nearly flat lying 22 meter thick body of pyritized and silicified breccias in dacite
following a low angle fault zone.
The East Zone consists of two sub-parallel, sub-vertical dipping hydrothermal breccias developed within a tuffaceous dacite
and has been outlined over a strike length in excess of 400 metres and a maximum width of approximately 225 metres.