In 1874, according to goldfield regulations, the business area of the town was set out on an area thought to be non-auriferous ( not containing gold ).
22.
In 1861 Belt issued a separate work entitled " Mineral Veins : an Enquiry into their Origin, founded on a Study of the Auriferous Quartz Veins of Australia ".
23.
The spectacular gold mine at Las Medulas was worked by no fewer than seven long aqueducts cut into the surrounding mountains, the water being played directly onto the soft auriferous ore.
24.
In 1921, upon returning from an assignment in British Columbia, Haley was retained by the Sierra Nevada gold belt showing distribution of the auriferous gravels ", in 1923.
25.
After sinking several shafts, they came across an auriferous lead at a depth of 5.4m and at a distance of 20m from a reef, which provided rich specimen stone.
26.
Auriferous copper was discovered in 1926 by W . H . Shetland in the Crystal Oak mine and the hand picked ore was railed to Charters Towers for treatment between 1928 and 1930.
27.
Mount Santo Tomas is close to the auriferous volcanic placements near Baguio, and beside the fault line which occasioned the July 16, 1990 earthquake devastating much of Luzon, and especially Baguio.
28.
Tourists can find there a large sample of mineral stones common in Bolivar state, as auriferous quartz, rose quartz, slate, iron, marble, bauxite, silicon, jet and ruffe, among others.
29.
Before the advent of modern metal auriferous sediments to be processed, consequently, any modern " puffer-belly " could be outfitted with a screen, or " grizzly " for sorting the dry gravels into two sizes.
30.
In order to recover the gold, the ore must be crushed, passed through a gravity circuit to recover the free gold present in some of the higher-grade lodes, and then subjected to flotation to produce an auriferous pyrite concentrate.
