[1][2] In one week in April, 1864, almost 550 ounces of gold were mined from Gibralter Hill, a yield of more than 58 ounces per ton of ore.[4] In 1893 the Gibraltar Gold Mining Company exhibited gold ore from the hill at the World's Columbian Exposition in Chicago yielding a net of 6 ounces of gold per ton.

£500,000 worth of gold was won before the grades declined and the company ceased mining,[8] in 1901.

The mine then continued to be worked, on a small scale, by tribute miners.

The company resumed operations in December 1907,[9] but the mine was closed by 1916.

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