1) Use the legends at the bottom of the map to find the locations where metallic sulfide and gold deposits have been identified. Which mountain is closest to the deposits? 2) The hydrothermal fluids carrying the metallic minerals came from igneous rocks, but did they deposit those minerals within igneous rocks? From the map, identify the rock type (igneous or sedimentary) where most of the ore minerals are deposited. 3) Why do you think the ore deposits formed within that rock type?
1) Use the legends at the bottom of the map to find the locations where metallic sulfide and gold deposits have been identified. Which mountain is closest to the deposits?
2) The hydrothermal fluids carrying the metallic minerals came from igneous rocks, but did they deposit those minerals within igneous rocks? From the map, identify the rock type (igneous or sedimentary) where most of the ore minerals are deposited.
3) Why do you think the ore deposits formed within that rock type?
4) Now look at the high-angle faults shown in the map. Faults often provide pathways for fluids bearing metallic minerals. What is the spatial relationship between the high angle faults and the metallic sulfide and gold deposits? Note: consider "close" to mean within ~500 m.
5) Based on this geologic map and your answer to the question above, what locations are reasonable places to look for similar deposits? Base your answer on whether the rocks that might house those deposits and/or faults that might carry the mineral-bearing fluids are present.
6) The area around Homestake Mine, Montana, is currently under a “no-mining” rule. In the future, there is a high probability that this region will see active mining once again.
There is a high likelihood of earthquakes in this region due to the igneous activity under Yellowstone National Park, and while most of the earthquakes are small, there have been some large earthquakes (such as a magnitude 7.3 in 1959) in the region. What type(s) of environmental concern(s)/hazards would a large earthquake pose to a mine? Explain your answer.
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