When the mine was acquired in 1995, its cash cost to mine silver was about $6 an ounce.

Later, the antimony mines were acquired by German industrialists which further strengthened the economy.

The mine was subsequently acquired by the Calleja Group transport company primarily as a dump for green waste.

The mine was then acquired by Petra Diamonds in 2007 and is currently still in operation.

In 1939, the mine was acquired by the family firm of Talkumwerke Naintsch.

In 2003, the mine was acquired by Boral.

The mine and area around it were acquired by the city of Negaunee in 2003 and the danger from undermining re-evaluated.

In 1881, the mine was acquired by Iwasaki Yatarō.

The mines were all acquired by the National Coal Board on nationalisation in 1947.

Mrs Clark's mines were acquired in 1864.