Boart Longyear samples for the proposed Golden Gate Bridge in San Francisco. In spite of the financial crisis, the 1930s saw improvements in diamond drilling technology, including the use of industrial-quality diamonds mined in Africa that were called “boarts.” In 1936, South Africa’s Anglo American Corporation formed Boart Products South Africa (Pty) Limited, which was later named Boart International. The new company developed the first mechanically-set diamond core bits, which were less expensive than the hand-set core bits that used more expensive Brazilian diamonds (carbonados). Longyear’s business gradually improved in the 1940s in response to expanding worldwide mineral exploration. In 1949, the
Uncontrolled waste Uncontrolled waste Uncontrolled waste is a group of waste types that do not fall into either the controlled, special or hazardous waste categories, such as specific mining wastes and agricultural wastes. This should not be confused with an alternative definition of uncontrolled waste that refers to improper waste disposal. Uncontrolled waste has significant impacts on the environment. In certain areas of Germany, it was found that industrial waste such as from ore smelting and waste products produced from petrochemical plants were found near population centers. Main effects of waste such as these lead to contamination of groundwater from toxic chemicals,