41. Private assay offices catered to the individual prospector, and to miners who stole gold out of the mines. 42. At 131 years, the Jacobs family assay office tradition was the oldest in the country when it closed. 43. The early smelter works and assay office are now mainly surface archaeological structures following their demolition and subsequent erosion. 44. The assay offices were regulated by sections 54 through 60, under the control of the Director of the Mint. 45. During its early years as an Assay Office , the Denver plant was the city's most substantial structure. 46. Organ also had two large mining furnaces for smelting ore and a geological assay office belonging to the mining company. 47. He later made scales for the Mexican Mint, Assay Office in New York, and the San Francisco Mint. 48. In 1865, he founded with John H . Boalt an assay office and consulting firm in Austin, Nevada. 49. The Assay Office was constructed along with a store and boarding house, a large mill was built in 1901. 50. Although assay offices were a common and important feature of mining infrastructure, the majority in Queensland have not survived.
