All of the points you mentioned reflect negative impacts of gold and silver mining in the West, but some are more directly associated with the societal and environmental consequences of mining activities. Here's a breakdown of each point:
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Tent cities near the mines fostered criminals as long-term residents: This point highlights the lawlessness that often developed in mining towns, where transient populations could lead to increased crime and instability.
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Ghost towns were left behind after the mines stopped producing: Many mining towns became abandoned once the resources were depleted, leading to ghost towns that reflected economic collapse and dislocation of communities.
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Mining camps were sources of many contagious diseases: The influx of people into mining camps often led to overcrowded conditions that facilitated the spread of diseases, posing significant public health risks.
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Mass migration from the East Coast led to social tension among merchants: The sudden influx of people could create competition and tension among merchants and settlers, affecting local economies and social structures.
In summary, while all options indicate negative impacts, points 1, 2, and 3 are particularly focused on the societal and public health consequences of mining.