Through the end of the 1800s tributers continued to pick copper out of that part of the old workings that remained above water level. Through 1888, the mine had yielded 17,352 tons (15,742 mt) of copper, as well as 533 pounds of silver. In 1899 the property was acquired by the Michigan Mining Company, which also bought the nearby Rockland and Superior mines. In 1903, the Michigan company opened the Calico amygdaloid, which held 3% copper ore, and outcropped on the Minesota property only 140 feet (43m) from the outcrop of the Minesota fissure vein.