Skyline Mine 3

This article is part of the Global Coal Mine Tracker, a project of Global Energy Monitor.

Download full dataset

Report an error

Sub-articles:

Global coal mines Coal mines in China Coal mines in India Coal mines in the United States Coal mines in Australia Coal mines in Russia Coal mines in Indonesia

Related-articles:

Largest coal mines in the world Coal mine impacts from Covid-19 Environmental issues of coal Coal mining Coal reserves Coal terminals

Skyline Mine #3 is an operating coal mine in Helper, Carbon County, Utah, United States.

Location

Table 1: Project-level location details

Mine Name	Location	Coordinates (WGS 84)
Skyline Mine #3	Helper, Carbon County, Utah, United States	39.684262, -111.203361 (exact)

The map below shows the exact location of the coal mine:

Loading map...

Project Details

Table 2: Project status

Status	Status Detail	Opening Year	Closing Year
Operating	–	1979	–

Table 3: Operation details

Note: The asterisk (*) signifies that the value is a GEM estimated figure.

Capacity (Mtpa)	Production (Mtpa)	Year of Production	Mine Type	Mining Method	Mine Size (km2)	Mine Depth (m)	Workforce Size
–	2.70613196	2025	Underground	–	–	373*	434

Table 4: Coal resources and destination

Total Reserves (Mt)	Year of Total Reserves Recorded	Total Resources (Mt)	Coalfield	Coal Type	Coal Grade	Primary Consumer/ Destination
–	–	–	Uinta Basin	Bituminous	–	–

Table 5: Ownership and parent company

Note: To access more comprehensive data on energy ownership, please visit the Global Energy Ownership Tracker.

Owner	Parent Company	Headquarters
Canyon Fuel Company LLC [100.0%]	Wolverine Fuels LLC [100%]	USA

Table 6: Historical production (unit: million tonnes per annum)

ROM or Saleable	2017	2018	2019	2020	2021	2022	2023	2024	2025
ROM	4.37	3.6	3.91	3.71	3.53	2.52	2.83	–	2.71

Expansion/Extension

Table 7: Project status

* Added capacity of a coal mine refers to the enhancement in the mine's production capabilities beyond its initial production capacity.

Status	Status Detail	Project Type	Project Phase	Added Capacity (Mtpa)*	Start Year
Proposed	Permitted	Expansion	–	–	–

Note: The above sections were automatically generated and are based on data from the Global Coal Mine Tracker August 2026 release.

Ownership Tree

This ownership tree is part of the Global Energy Ownership Tracker, a project of Global Energy Monitor.

Background

The Skyline Complex was initially owned by Arch Coal as part of Arch Coal's western bituminous mining region, which sold 20.6 million tons of coal in 2008. However, in June 2013, the mine's operator and Arch Coal subsidiary, Canyon Fuel Company LLC, was sold by Arch Coal Inc. for US$435 million to Bowie Resources, a mining firm from Kentucky. The sale consisted of the Sufco Mine in Sevier County, the Dugout Canyon Mine in Carbon County, and the Skyline Complex on the Emery/Carbon county border.

Bowie Resources is now known as Wolverine Fuels LLC.

Extension

In August 2025, the U.S. government approved an environmental impact statement for a Skyline mine modification via an expedited environmental review designed to fast-track energy projects in response to the U.S. national energy emergency declared by the Trump Administration in January 2025. Submitted by operator Canyon Coal Company, the modification project will add a new coal lease (the Flat Canyon Federal Coal Lease Tract) encompassing 660 acres and an estimated 2.1 million tons of recoverable coal to the mine's existing operations. The addition will extend the Skyline mine's life by up to 12 years.

Around this same time, Canyon Coal Co. also bid to lease the Little Eccles Federal Coal Lease Tract, however, U.S. officials rejected the bid in October 2025 because it didn't meet the fair market value requirements of the Mineral Leasing Act.

Methane Plumes Detected Nearby

Global Energy Monitor researchers analyze satellite-detected methane plumes in order to determine whether they have been observed at or near the site of GEM energy assets. The satellite data provider creates imagery of individual methane plumes and estimates their emission rates at the time of observation. GEM has reviewed many of these plume detections against Google Earth imagery and GEM’s own energy infrastructure tracker data. The following table lists methane plumes which are associated with the energy asset or facility based on distance and manual review. (A full description of the analysis process is available in the Global Methane Emitters Tracker methodology wiki page.)

Table M1: Plume details

For additional details on this individual plume identification and others, see the Global Methane Emitters Tracker.

Observation date	Satellite data provider	Location of plume origin	Methane emissions rate	Additional plume information
2020-07-31T17:36:03+00	CarbonMapper, GAO20200731t173603p0000-A	39.684543, -111.15722	421.1544079 kg/hr	Utah State Methane Observation 2020-07-31, 1

Articles and Resources

Additional data

To access additional data, including an interactive map of world coal mines, a downloadable dataset, and summary data, please visit the Global Coal Mine Tracker on the Global Energy Monitor website.