공시 • Oct 15
Alderan Resources Limited Commences Drilling at Detroit Project Targeting Carlin-Like Gold Mineralisation
Alderan Resources Limited (Alderan or the Company) announce that it has commenced drilling at the Mizpah prospect at the Detroit Mining Project, Utah, USA. Alderan will drill a minimum of six holes for 1,200m in its maiden drill program at Detroit, aiming to test gold sulphidisation intersected which was identified by the Company's review of historical drilling at the project. The drilling will test the full thickness of the reactive 'dirty limestone' stratigraphy beneath and down-dip of the Mizpah oxidised gold mineralisation, as well as known gold mineralised intrusives and skarns that are reflected in the ground magnetics. The Detroit Project is located in the Drum Mountains, about 56km northwest of Delta, Utah, which is host to a range of mineralisation styles. Location of the range and adjacent areas. The focus of Alderan's exploration efforts at Detroit is to discover a Carlin-like gold deposit. Key features of Carlin-like deposits include: a) Favorable permeable reactive rocks (silty limestones and limey siltstones); b) Favorable structures often coincident with mineral-related intrusives; c) Gold-bearing hyrdogeochemical hydrothermal solutions; d) Micron-sized gold in fine-grained disseminated pyrite; e) Common geochemical indicators As, Sb, Ba, Te, Se, Hg; and f) Common argillization and jasperoids; fairly common decalcification. Alderan designed the drill program after a review of results from a ground magnetic program integrated with the surface geological and geochemical mapping at the Mizpah prospect identified two intense magnetic anomalies. It expects first results from the drill program January, 2021. The Drum Mountains of west central Utah have long been a subject of mining, targeting gold, copper, and manganese in the late 1800's and early 1900's. This was followed by renewed interest in beryllium, gold, manganese, and uranium in the past 20 years. Gold and copper were discovered in the Drum Mountains in 1872, and from 1904 to 1917, gold, silver, and copper were produced from siliceous replacement fissure deposits in jasperoids, limestone and dolomite. Several samples of jasperoids similar to that which is commonly found in highly productive mining districts were collected in the Drum Mountains of Utah in 1963 as part of a study of the significance of jasperoid related to ore deposits. Later chemical analysis revealed that some of these samples contain as much as one-fourth of an ounce of gold per ton (7.7 g/t Au) as well as anomalous concentrations of other metals. Earlier reports indicated that gold production in the area was largely confined to the jasperoid. Geochemical sampling in the Drum Mountains of Utah in the late 1960's revealed anomalous concentrations of gold in jasperoid outcrops. The gold-bearing jasperoids also contain anomalous amounts of other ore-stage metals and are useful guides to further exploration. Other elements detected include: Ag, Bi, As, Sb (Antimony), Sn, Pb, Cu, Hg (mercury), and yttrium. None of these elements correlates strongly with the gold on a sample for sample basis. However, all give distribution patterns are broadly similar to that of gold. The similarity of geochemical patterns suggests a common origin of mineralizing solution or solutions throughout the area sampled. Of 4,000 particles of gold studied by the USGS survey, noted the small size of the gold particles in the samples that is similar to that found in the gold deposit at Carlin, Nevada, which previously had been noted as no pannable gold was found in samples containing as much as 4 ounces of gold per ton. Exploration for Carlin-type gold orebodies in the western United States typically involves sampling and
analysis of jasperoid a distinctive alteration type formed by intense silicification of marine sediments. In the study by Nelson9, rock suites were collected from six orebodies and four similar but barren systems. Jasperoids at all ten systems contain episodically silicified breccias, quartz vein stockworks, elevated As, Sb, Hg, Ba and Tl, and, locally, anomalous Au and Ag.