• Data Access
  • Your Email  
  • Your Email  
Keep me signed in.
Forgot your password?
Close
  • Forgot Your Password?
  • Enter the email you signed up with and we'll email it to you.
  • Your Email  
Close
Back
MDO
Mining Data Solutions
  • Home
  • Database
  • Subscribe
  • Sign In
  • Sign In
United States
Dry Fork Mine

This page is not tailored to
devices with screen width under 750 px.
 Location:
10 km NW from Gillette, Wyoming, United States

  Address:

P.O. Box 1809
Gillette
Wyoming, United States
82717
Phone  ...  Subscription required
Fax(307)-682-6468
WebsiteWeb
Additional Resources for Suppliers & Investors
Drill results over 30 g/t Au
Stay on top of recent discoveries.
Search drill results by commodity and grade.
Largest mines in the Americas
Mining and mill throughput capaciites.
Full profiles of select mines and projects.
Deepest underground mines
Shaft depth and mill throughput data.
Full profiles of select mines and projects.
Heavy mobile equipment
HME type, model, size and quantity.
Full profiles of select mines and projects.
Permitting and construction projects
Projects at the permitting or construction stage. Full profiles of select projects.
Mines with remote camps
Camp size, mine location and contacts.
Full profiles of select mines and projects.
Mines & projects in United States
A list of country's mines and projects.
Full profiles of select mines and projects.
  • Overview
  • Owners
  • Geology
  • Mining
  • Processing
  • Production
  • Reserves
  • Fleet
  • Personnel
  • Filings & News

Thank you for browsing through mine profiles compiled by the Mining Data Online team.

Would you like to subcribe or schedule a Demo?
  • Name:
     
  • Company:
     
  • Position:
     
  • Phone:
  • Email:
  • Message:

Overview

StageProduction
Mine TypeOpen Pit
Commodities
  • Coal (thermal)
Mining Method
  • Truck & Shovel / Loader
Mine Life2053
The strip ratio increased during 2018 because mining in Pit 1, which had a relatively low strip ratio, came to an end. All the coal in Pit 1 was mined out by mid-2018. This necessitated the transition to Pit 3, a new pit with a higher strip ratio. The combination of Pit 3 and Pit 2 resulted in an overall increase in the strip ratio of slightly more than 7%. Along with this increase in strip ratio, the mine also saw an increase in the haul distances for coal and overburden, which is typical when there is a transition to a new pit.


Owners & OPERATOR

Source: p. 1
CompanyInterestOwnership
Western Fuels Association Inc. 100 % Indirect
Western Fuels-Wyoming Inc. (operator) 100 % Direct

Deposit Type

  • Sedimentary


Summary:

General Geology
The strata in the Dry Fork Mine (DFM) permit area generally show northwest to north-northwest strikes and gentle westward dips. The synclinal axis trends north to northwest near the western edge of the PRB, adjacent to the Casper Arch and the Big Horn Mountains. Gentle folds occur on the eastern and northern flanks, while faults and locally overturned beds are characteristic of the much steeper western and southern flanks. The northern and eastern areas of the basin have gentle dips that seldom exceed a few degrees. Regional dips in the Gillette area are from 0.5 degrees in the surface sediments to 3 degrees in the deeper sediments toward the southwest. No major faults have been mapped in the Gillette area (Hodson et al. 1973).

The general analysis area (northern group of mines - Dry Fork, Rawhide, Buckskin, Eagle Butte, Synthetic Fuels, and Wyodak, in the part of the Northern Great Plains that includes most of northeastern Wyoming) contains the following stratigraphic units or layers (in descending order from the surface): Quaternary (most recent) deposits, the Eocene Wasatch Formation, and the Paleocene Fort Union Formation.

Surficial Geology – Quaternary deposits in the general analysis area consist of alluvium, sheetwash, colluvium, and lacustrine deposits. Quaternary deposits represent a minor component of the surficial geology within the DFM area. Exposed and weathered Wasatch Formation residuum comprises the majority of the surficial geology within the Project Area. The Wasatch Formation residuum flanks a ridge of exposed Wasatch bedrock that occupies the central portion of the general analysis area.

Wasatch Formation - The Eocene Wasatch Formation comprises the majority of the overburden, which consists mainly of interfingering lenses of claystone, siltstone, and sandstone. The overburden contains clinker (variously called Wyoming porcelanite or scoria), coal stringers and carbonaceous shales.

Fort Union Formation - The Paleocene Fort Union Formation consists primarily of siltstones, mudstones, claystones, shales, lenticular sands/sandstones, and coal seams. The Fort Union Formation is divided into three members, in descending order, the Tongue River (which contains the mineable coal seams), the Lebo, and the Tullock (Flores et al. 1999). The coal to be mined in this area is within the Wyodak-Anderson coal seam, which is the uppermost unit of the Tongue River Member of the Paleocene Fort Union Formation. In the mine permit area, a claystone and carbonaceous coal lens separate the Wyodak-Anderson seam into the upper Anderson coal seam and the lower Canyon coal seam. For this EA, the coal to be mined will be referred to as the Wyodak-Anderson seam. The coal is consistently underlain by shale, claystone, or occasionally siltstone throughout the Dry Fork mine. The Wyodak coal seam is nearly flat-lying with minor variations and dip reversals, which very likely reflect the depositional environment (structural highs and lows) and/or differential compaction, rather than major tectonic deformation. Underlying the Fort Union Formation are the Cretaceous age Lance Formation, Fox Hills Sandstone, and Pierre Shale. Occasionally, mine water supply wells are constructed in the Lance-Fox Hills aquifer; otherwise, no mine related disturbance extends below the Fox Hills Sandstone.


Mining Methods

  • Truck & Shovel / Loader


Summary:

The DFM conducts open pit surface coal mine using conventional truck and loader methods. The average production rate at the DFM is approximately 6 million tons per year (Mtpy) and the maximum production rate is 15 Mtpy. A2Tr1 would not change the average production rate or the maximum production rate for the life of the mining operation. This mining plan modification would extend the life of the mine by approximately 5.3 years, concluding in 2053.

Front-end loaders are the only loading piece of equipment utilized at Dry Fork Mine andare critical to the operation. [2018 Annual Report, p. 18]


Crushing and Grinding


Processing


Summary:

Systems installed included a truck dump/crusher station, conveyors, silo storage feed and reclaim, transfer building, train loadout building, precision batch loadout system.

TECHNICAL DETAILS
Installed 2,270 lf of conveyors
One Gundlach Crusher
One Stamler Feeder/Breaker
One Schilbe & Smith Sampling System
One 120 ton loadout by Kanawha Scales System
Four pneumatic dust collectors
Installation of a 69 kVA substation and power distribution for the entire facility


Production:

CommodityUnits201920182017201620152014
Coal (thermal) tons  ......  Subscription required  ......  Subscription required6,045,6186,141,4336,369,2065,373,973
All production numbers are expressed as ROM coal.
Subscription required - Subscription is required.


Reserves at December 31, 2018:
The Mineral Resources as at 31th December 2019 at Dry Fork mine are unchanged from Dec 31, 2018

CategoryTonnage Commodity
Proven & Probable 250 M tons Coal (thermal)


Heavy Mobile Equipment as of December 31, 2018:
HME TypeModelQuantity
Excavator
Loader (FEL) ....................... Subscription required 2
Subscription required - Subscription is required.

Mine Management:

Job TitleNameProfileRef. Date
....................... Subscription required ....................... Subscription required Subscription required Aug 10, 2020
Subscription required - Subscription is required.

Staff:

Total WorkforceYear
Subscription required 2019
Subscription required 2018
Subscription required 2017
Subscription required 2016
Subscription required 2015

Corporate Filings & Presentations:

DocumentYear
................................... Subscription required 2020
................................... Subscription required 2019
................................... Subscription required 2018
................................... Subscription required 2018
Environmental Assessment 2017
Other 2017
Other 2017
Press Release 2017
Subscription required - Subscription is required.

Aerial view:

Subscription required - Subscription is required.

Terms of Use Privacy Policy © 2020 MDO Data Online Inc.