Arsenic is often found alongside the red metal on the west coast of South America, home to the world’s largest copper reserves. Until recently, mining companies there chose not to develop copper ...
By the time operations ceased in 1827 it had produced 40 tons of copper ore. Reopening as the `Clitters Adit& 39; mine in 1858 and renamed the `Gunnislake Clitters& 39; mine in 1877, it continued production of copper, tin and arsenic until closure in 1889 at a time of widespread economic failure of Cornish mining.
Arsenic is found in the smelter dust from copper, gold, and lead smelters, and is recovered primarily from copper refinement dust.41On roasting arsenopyrite in air, arsenic sublimes as arsenic IIIoxide leaving iron oxides,38while roasting without air results in the production of gray arsenic.
David Duckworth of consulting company Saint Barbara notes that “the issue of high-arsenichigh-Ascopper concentrates has been highlighted recently with the start-up of a number of new projects producing this material. “Copper concentrates can be divided into clean or complex types,” he writes in the company’s latest newsletter.
Copper gives way to arsenic. By 1884, the quality of the copper ore produced at Devon Great Consols was poor, yielding more arsenic than copper. After being sorted by the mine& 39;s bal maidens, the copper ore was sent to south Wales to be smelted. The company began exploring the possibility of tin deposits at the mine but found none.
Arsenic may also be obtained from copper, gold, and lead smelter flue dust as well as from roasting arsenopyrite, the most abundant ore mineral of arsenic. However, arsenic is not recovered from these sources but is rather disposed of in an environmentally safe manner. Arsenic has been commercially recovered from
Traders are valuing high-quality copper concentrates much more highly than the high-arsenic ores produced at some mines in countries including Chile, Peru and Bulgaria.
In addition, contact with adults who are wearing clothes contaminated with arsenice.g., with dust from copper- or lead-smelting factories, from wood-treating or pesticide appli ion, or from arsenic-treated woodcould be a source of exposure.