Mines seldom kill wildlife directly, yet the mines must comply with the endangered species act. under this act, what must the mines protect

The answer to the question asked  above is the General Mining Act of 1872.
Mines must comply with the Endangered Species Act know as General Mining Act of 1872.
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It depends on the surface of the levels. the rougher the surface, the greater is the frictional force. for rougher surfaces, you would need to exert greater force to move the object. the concept is that, you must overcome the frictional force in order to bring the object into motion. this is the reason why we add lubricants to the joints so they could easily move. this answer was on