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
Solid Waste Disposal Act of 1965 and Solid Waste Amendment (HSWA). After the industrial revolution lead to increases in municipal waste, local and regional governments and private individuals developed many diverse, and frequently unsafe or unsanitary, disposal technologies for disposal of this waste. The most frequent disposal method used was open dumps and burning of trash. As the Germ Theory of Disease developed in the late 19th and early 20th century, this led to increased attention of waste disposal as a public health crisis in the United States. Due to increasing demand for better waste management during the 1960s, the United States passed SWDA in 1965.