The most profitable mines in the United States, according to a recent report by the US Department of Labor, are located in the Rocky Mountains, the Pacific Northwest and the Rocky Mountain states.
The Department of Commerce, which publishes the report, found that in 2011, the US gold and silver mines produced $6.6 billion in revenues for the mining industry.
The most-profitable mines in each of the three states produced an average of $2.2 billion in revenue each year, the report said.
The top two states for mining revenues in 2011 were Arizona and Nevada, which accounted for $1.8 billion and $1 billion, respectively.
The report does not break down the revenue streams of the mines in different states, but the average revenue per dollar of the US mining industry was $11.25 in Nevada and $11 in Arizona, according a report by Business Insider.
Mining revenue is not the only industry that generates revenues.
The study also looked at revenue from sales and services and other revenue streams, which totaled $9.4 billion in 2011.
Mining services, which includes mining operations and operations that process minerals, accounted for more than half of mining revenue, the study said.
Mining activities and revenue from retail sales accounted for only $3.4 million of the mining revenue in 2011 and the study did not include any revenue from mineral exploration and mining, the analysis found.