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Bureau of Mines evaluates Alaskan phosphate deposits

机译:矿业局评估阿拉斯加磷酸盐矿床

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摘要

The US Bureau of Mines (USBM) completed a mineral L resource assessment of the 68,000-km~2 (17 million-acre) Colville mining district and the southern portion of the National Petroleum Reserve in Alaska. This is one of a series of assessments conducted by the agency on federal, state and native lands in Alaska and took four years to complete. The district lies on the north side of the Brooks Range, 465 km (290 miles) northwest of Fairbanks and 275 km (170 miles) southwest of the Prudhoe Bay oil field. During the study, a series of sedimentary phosphate occurrences were evaluated. These consisted of phosphate-bearing oolitic, shaley limestone and mudstone beds, concentrated in the Upper Mississippian Lisburne group and to a lesser extent the Triassic Otuk formation. Phosphate-bearing rocks were traced intermittently along an east-west trend for at least 232 km (144 miles) across the northern foothills of the Brooks Range. The phosphatic beds have dips ranging from 30 deg to near vertical. They are best exposed in a monoclinal structure.
机译:美国矿业局(USBM)完成了对68,000公里〜2(1,700万英亩)科尔维尔矿区和阿拉斯加国家石油储备南部的矿产资源评估。这是该机构在阿拉斯加的联邦,州和本国土地上进行的一系列评估之一,完成了四年。该地区位于布鲁克斯山脉(Brooks Range)的北侧,在费尔班克斯(Fairbanks)西北465公里(290英里),在普拉德霍湾(Prudhoe Bay)油田西南275公里(170英里)。在研究过程中,评估了一系列沉积磷酸盐的发生。这些由含磷酸盐的橄榄岩层,页岩灰岩层和泥岩层组成,主要集中在密西西比上里斯本地区的上部,三叠纪的奥图克地层较小。沿布鲁克斯山脉北麓的东西走向断断续续地沿着至少232公里(144英里)追踪含磷酸盐的岩石。磷酸盐床的倾角范围为30度到接近垂直。它们最好以单斜结构暴露。

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