Westmoreland coal mine

Coal mines and thermal power plants have used Rulmeca Motorized Pulley conveyor belt drives for more than 60 years.


Mining, Coal and Lignite
Westmoreland coal mine



Conveying material

  • Project nameWestmoreland coal mine
  • Project locationUnited States of America
  • Customer typeEnd User
  • Customer websitewestmoreland.com


Coal mines and thermal power plants have used Rulmeca Motorized Pulley conveyor belt drives for more than 60 years.  From Kazakhstan to the US to Thailand, on every continent, mine and plant operators have learned that Motorized Pulley technology is reliable, safe, and easy to install.  The Westmoreland Kemmerer, Inc. coal mine in Kemmerer, Wyoming is a 13,400 acre opencast mine complex which currently produces coal in three active areas from 12 primary seams and splits.  It opened in 1881 as the Twin Creek underground mine to work the Adaville Formation and opened the Elkol Underground Mine in 1950.  The mine supplies approximately 2.8 MTPY of coal to a 700 megawatt thermal power plant, adjacent to the mine, via a 4,200 ft long overland conveyor.

Operational challenge

Faced with an aging silo reclaim conveyor and 20 years of coal in reserve, the mine decided to improve plant efficiency and plan for the future, by upgrading a problematic drive system on the 450 ft long 54 in wide inclined #130 conveyor in 2015.  Fed by three weigh belt feeders beneath three silos at a rate of 1,600 tph, this convex conveyor feeds the overland conveyor as well as a truck loader.

Eventually, the exposed drive system became unreliable due to chronic coupling failures (requiring weekly re-welding) and occasional pulley slippage. Slippage was most prevalent during winter weather temperature, which can approach -30°F.

In addition to improving conveyor reliability and performance, mine management has a strong desire to improve working conditions for plant personnel while reducing the cost of maintenance as much as possible.


Quick Installation

Conveyors & Equipment of Salt Lake City, UT suggested that Kemmerer Mine consider a Rulmeca Motorized Pulley to replace the aging #130 conveyor drive in 2015.  By December of that year, one 180 HP model 800HD Rulmeca Motorized Pulley was installed in the conveyor head position (Figure 3).  The installation crew only required one shift to install the 5,700 lb Motorized Pulley thanks to the pulleys’ compact size, light weight, and ease of alignment.  Time-consuming drive component alignment was unnecessary because all drive components are internal and pre-aligned.

Kemmerer Mine Maintenance Superintendent, Jerry Schinke, said, “The actual install of the Rulmeca Motorized Pulley was quick and painless. There was a noticeable drop in the noise level and I am looking forward to the heat from the pulley keeping the belt ice free.”

Motorized Pulleys, in general, increase system reliability, lower maintenance expense, improve personnel safety, save space, and reduce power consumption because they enclose all drive components within an oil-filled and hermetically sealed pulley shell.

The Kemmerer Mine’s adoption of Motorized Pulley technology is part of a local trend, which began in the trona mines in southwestern Wyoming several years ago in both surface and underground conveyors.  The acceptance of Motorized Pulley technology throughout the US, across Europe, and in Asia began slowly in the 1980s but has accelerated in this century.

related success stories

Cintasa - design and manufactureof conveyors systems

The main activity of Cintasa centres in the engineering, production andinstallation of handling, transport and warehousing element systems.

Read more

Cold rollers for cool calculators

Tests carried out by Chilean conveyor technology specialist Tecnología en Transporte (TTM) have shown that precision rollers from German manufacturer Rulmeca are much better suited for heavy-duty conveyors.

Read more

Customers in Thailand rely on proven products

The long-term relationships of RULMECA to the owner of the opencast mine as well as to the service provider for the overburden excavation and the associated very good experiences with RULMECA products made SAHAKOL easy to make the decision.

Read more

DSI sandwich belt high angle conveyor

The conveyor drive area of the Sandwich Belt high angle conveyor is restricted.

Read more

Excavator Schleenhain opencast mine

Rulmeca Germany, together with the customer MIBRAG, has developed a concept of how energy efficiency can be increased by using a drum motor and noise emissions can be reduced.

Read more

New heap leach conveyor extension project

Synergy International FZE turned to Rulmeca to select the components necessary for the construction of a conveyor belt to transport the gold rocks from the Ma'den mine (United Arab Emirates) to the leaching area.

Read more

Re-design of conveyor drive station

At the beginning of the year Rulmeca was asked to supply idler garlands and idlers for a new drive station at MIBRAG Lignite mine "Vereinigtes Schleenhain" Germany.

Read more

Tormets Oy (Finland)

Project for Metso Minerals Ab (Sweden), end customer Boliden Ab in Aitik (Sweden)

Read more

USA various projects

Some of the US customers who have relied on Rulmeca.

Read more

3DDrawings | Bulk & Unit

Download our standard Bulk & Unit catalog drawings in the main 2D and 3D formats in 3DDrawings


Subscribe to our newsletter

Sign up for our newsletter and you will always be up to date with the latest news.