Livengood Terrane

Tags: basalt campanian chert claystone devonian dolostone limestone lower paleozoic ophiolite upper proterozoic

Description:

The Livengood deposit is hosted by rocks of the Livengood Terrane, an east–west belt, approximately 150 mi (240 km) long, consisting of tectonically interleaved assemblages, which include:
i) the Amy Creek assemblage, a sequence of latest Proterozoic and/or early Paleozoic basalt, mudstone, chert, dolomite, and limestone;
ii) a Cambrian ophiolite sequence of mafic and ultramafic sea floor rocks thrust over the Amy Creek Assemblage, in turn overthrust by;
iii) a sequence of Devonian clastic sedimentary, volcanic, and volcaniclastic rocks (Athey, et al., 2004).

The Devonian rocks are the dominant host to the mineralization at Livengood and have been informally subdivided into “Upper Sediments” and “Lower Sediments” stratigraphic units, separated by volcanic rocks (“Volcanics” or “Main Volcanics”). The Devonian assemblage was overthrust by a second klippe of Cambrian ophiolite and structurally intercalated cherty sedimentary rocks (“Money Knob”). All of these rocks are intruded by post-thrusting, Cretaceous (91.7 – 93.2 My; Athey, Layer, and Drake, 2004) multiphase monzonitic and syenitic dikes; gold mineralization is spatially and temporally associated with these intrusive rocks.

Terrane map of Alaska showing Livengood Terrane (LG: red arrow)

Deposits

• Name: Livengood

  Phase: Exploration

  Mine Type: Pit

  Intro:

  The Livengood property is located approximately 70 mi (113 km) by road (47 mi (75 km) by air) northwest of Fairbanks, Alaska in the Tolovana Mining District within the Tintina Gold Belt. The deposit area is centered near Money Knob, a local topographic high point. This feature and the adjoining ridge lines are the probable lode gold source for the Livengood placer deposits that lie in the adjacent valleys. These placer deposits have been actively mined since 1914 and have produced more than 500,000 oz of gold.

  detailed

Mineralizations

No mineralizations available.

Placers

No placers available.