NI 43-101 Technical Report for the Seventymile Project in Alaska, United States dated September 2019 (Q29682): Difference between revisions

continental arc magmatism occurred during the Late Devonian to Early Mississippian, Permian, and Late

been identified, occurring respectively during Late Devonian to Early Mississippian, Permian, and lastly

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Permian Period

during the Late Devonian to Early Mississippian, Permian, and Late Triassic to Early Jurassic. Further

the “Seventymile terrane”, a narrow assemblage of Permian-aged submarine ophiolitic ultramafic rocks,

covers a narrow assemblage of Seventymile terrane Permian ophiolitic ultramafic to mafic rocks, other

respectively during Late Devonian to Early Mississippian, Permian, and lastly Late Triassic to Early Jurassic

fabric marking much of the YTT was formed from the mid-Permian to the onset of magmatism in Late Triassic

the “Seventymile terrane”, a narrow assemblage of Permian-aged submarine mafic to felsic volcanic

originally divided the YTT, but closed in the mid-Permian due to short-lived westward subduction under

unit of micaceous dolomitic siltstone containing Permian brachiopods occurs above the volcaniclastic

WNW-ESE-trending portion of a narrow assemblage of Permian Seventymile terrane rocks, bounded to the

mesothermal auriferous quartz vein and gouge zones within Permian basalt and serpentinite. Auriferous targets

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Cretaceous Period

dextral displacement of roughly 400 km since the late Cretaceous. Conjugate to the Tintina and Denali

subduction-related magmatism occurred into the mid-Cretaceous, resulting in emplacement of batholithic-scale

silicic volcanic and subvolcanic rocks near a late Cretaceous monzonite. Sample results revealed weakly

displacement of roughly 400 km, occurring since the late Cretaceous. Nelson and Colpron (2007) estimated

of the Black Mountain fault has been intruded by Cretaceous to Tertiary plutonic rocks (Flanders,

dyke that is possibly contemporaneous with the late Cretaceous monzonite intrusion at the Deep Creek

contacts and surrounding country rock of the late Cretaceous monzonite intrusion. Two lines, SVMGPT19-015

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Jurassic Period

Mississippian, Permian, and Late Triassic to Early Jurassic. Further subduction-related magmatism occurred

continental affinity (Foster, 1994), and including Jurassic to Early Tertiary metaigneous rocks. The

Mississippian, Permian, and lastly Late Triassic to Early Jurassic time (Mortensen, 1992). The major, subhorizontal

the rocks of the Yukon-Tanana Terrane during the Jurassic. The Seventymile fault, a splay of the

2 references

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Triassic Period

accreted terrane comprised mainly of Proterozoic to Triassic metaigneous and metasedimentary assemblages,

Devonian to Early Mississippian, Permian, and Late Triassic to Early Jurassic. Further subduction-related

accreted terrane comprised mainly of Proterozoic to Triassic metaigneous and metasedimentary assemblages

to Early Mississippian, Permian, and lastly Late Triassic to Early Jurassic time (Mortensen, 1992).

the mid-Permian to the onset of magmatism in Late Triassic time, and likely represents a major continent-continent

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Quaternary Period

Trench which has been partially filled by Tertiary and Quaternary sediments (Nelson and Colpron, 2007).

Broadly speaking, these deposits are young (Tertiary or Quaternary in age) and form within the top 1.5 km

from the Browns Hill Quarry basalt, an unmineralized Quaternary basalt flow from the Fairbanks Mining

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addresses place

Alaska

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data source

GeoArchive Collection of National Instrument 43-101 Technical Reports

reference statement

Linkage to this mine was established with a simple name match from imperfect metadata identifying the geographic area of the mining project

GDDID

620ed927ad0e9c819b0f35f2

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P97 (Deleted Property)

4530692:ND7CW47J Property P97 not found, cannot determine the data type to use.

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