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11Hydraulic mining — Hydraulic mining, or hydraulicking, is a form of mining that employs water to dislodge rock material or move sediment. Previously, the use of a large volume of water had been developed by the Romans to remove overburden and then gold bearing… …
12Hydropower — Hydropower, hydraulic power or water power is power that is derived from the force or energy of moving water, which may be harnessed for useful purposes.Prior to the widespread availability of commercial electric power, hydropower was used for… …
13California Gold Rush — The California Gold Rush (1848 ndash;1855) began on January 24, 1848, when gold was discovered by James Marshall at Sutter s Mill in Coloma, California. [E] vents from January 1848 through December 1855 [are] generally acknowledged as the Gold… …
14Leat — Devonport leat near Nun s cross farm A leat (also lete or leet, or millstream) is the name, common in the south and west of England and in Wales, for an artificial watercourse or aqueduct dug into the ground, especially one supplying water to a… …
15Natural History (Pliny) — Naturalis Historia, 1669 edition, title page. The title at the top reads: Volume I of the Natural History of Gaius Plinius Secundus. The Natural History (Latin: Naturalis Historia) is an encyclopedia published circa AD 77–79 by Pliny the… …
16Welsh gold — is highly prized because of its origin and scarcity, and occurs naturally in two distinct areas of Wales. One area is in North Wales in a band stretching from Barmouth, past Dolgellau and up towards Snowdonia. In South Wales it is found in a… …
17Distinctive feature — In linguistics, a distinctive feature is the most basic unit of phonological structure that may be analyzed in phonological theory. Distinctive features are grouped into categories according to the natural classes of segments they describe: major …
18Fire-setting — A method of mining, fires were set against a rock face to break the rock by thermal shock after dousing with water. Best performed in opencast mines, where the smoke and fumes could be dissipated safely, the technique was very dangerous in… …
19Mack Sennett — En 1910 Données clés Nom de naissance Michael Sinnott Surno …
20Micheal Sinott — Mack Sennett Mack Sennett Mack Sennett, de son vrai nom Michael Sinnott, (17 janvier 1880 à Danville, Québec 5 novembre 1960 à Woodland Hills, Californie) est un …
