Roof Master 1.7

The mechanized roof bolter for low seams.

The underground mining environment is a unique challenge. Roof drilling and bolt installation in underground mining is labor intensive, repetitive and exposes the operator to many hazards. High temperature (very often higher than 40 C), high humidity (above 98%), harmful gases generated during mining process and also gases which occur during drilling in virgin rocks – all these combined with aggressive, harsh mining water makes the miners’ job extremely difficult.

For many years Mine Master has been working with its well-known U.S. Partner – J.H. Fletcher on dedicated bolting solutions to provide the right equipment for demanding mining applications and to provide solutions to difficult conditions. As a result of the cooperation, two models of bolting rigs Roof Master series have been designed to meet customers’ requirements - underground rock bolting rig Roof Master 1.4 and Roof Master 1.7. In addition, to cope with changing conditions, continuous design process has been being implemented.

The Roof Master 1.7 is a mechanized rock bolter designed for bolting roofs and walls at minimum height of 1.9 m and max. reach up to 4,5m. The unit is designed to install both mechanical and resin bolts at the length of 1.6, 1.8 and 2.6m by a single operator. Dry drilling is performed by the rotary method which has the added advantage of very efficient dust collection system.  The operating controls are located next to the drilling unit, enabling accurate bolt installation - both mechanical or resin types. The operator stand is found directly by the roof bolting turret and it is protected by an adjustable, hydraulically operated, high-strength canopy. The tooling system enables drilling of holes at 25 - 38 mm DIA. Depending on the compressive strength of the rocks, effective time of bolt installation is between 2,5 to 3min per bolt (including hole drilling time). At KGHM Polish Copper Industry, 90% of bolting process is carried out by means of Mine Master bolting rigs.

New environmental challenges during the mining production process force OEM’s to introduce machines prepared for working in very tough conditions. To improve operator comfort, the Roof Master 1.7 is continually being modernized such as being equipped with an effective air curtain and compressed air resin inserter as well as other modifications requested by end users.

In order to conduct a more effective and productive bolting Mine Master offer two types of bolting monitoring systems on the underground bolting rig Roof Master 1.7. The Basic Monitoring System (BMS) is used for controlling tramming and hydraulic systems parameters. The Bolt Counting System (BCS) reports on the number of installed bolts, torque and hydraulic system parameters.

The bolting process with the Roof Master 1.7 is very efficient in soft rock - with around 100 bolts per shift in a production system. One of the mines in Estonia carries out 50% of its entire bolting works with Mine Master bolters.

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Technical information

Feature Unit Description
Type of machine    Roof Master 1.7
Length [mm]  10 500
Width [mm]  2 200
Tramming height [mm]  1 720
Working height [mm]  1 720
Outer turning radius [mm]  6 000
Inner turning radius [mm]  3 600
Weight [kg]  18 000
Gradeability [deg]  15
Cross-grade [deg]  8
Max. tramming speed [kph]  12
Length of bolts  [m]  1,2 / 1,6 / 1,8
Type of bolts    Mechanic or resin
Max. bolting height [mm]  4 000
Engine    Cummins
Tramming system    Mechanical (Powershift)
Boom    J.H. Fletcher
Rock drill    rotary J.H. Fletcher