what negative impact did gold and silver mining have in the west

A. tent cities near the mines fostered criminals as long term residents
B. ghost towns were left behind after the mines stopped producing
C. mining camps were sources of many contagious diseases
D. mass migration from the east coast led to social tension among merchants

B. ghost towns were left behind after the mines stopped producing

This negative impact is a result of the boom and bust cycle of mining in the West. When the mines stopped producing, many miners and their families left, leading to the abandonment of towns and economic decline in the region.