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Roberts & Schaefer Company has developed aggregate production
systems using their experience and understanding of the severe
conditions that exist in the quarry. Continued improvements in
raw material extraction and transportation have advanced the use
of in-pit crushing and overland conveying.
The use of mobile crushing units close to the working face and
movable conveyor systems provide efficient and versatile systems.
The application of in-pit crushing, near-pit crushing, and overland
conveying, significantly reduces the environmental impact caused
by truck haul operations.
Our "Full Service" experience includes investigation and feasibility
studies to determine the suitability of in-pit crushing and overland
conveying for each specific operation.
The following projects exemplify our experience.
GRANITE ROCK COMPANY
 In-pit
Crushing and Conveying System
Aromas, California
Granite Rock Company selected Roberts & Schaefer to design
and engineer an in-pit mobile crusher and overland conveyors to
eliminate haul trucks. For ease of maintenance, the system's major
components are off-the-shelf while Krupp built the mobile crusher.
In-depth project information
CALMAT
 Boulevard
Mine Extension Project Los Angeles, California
Roberts & Schaefer Company provided engineering services
for four overland conveyor belts on a time and material basis.
The four conveyors totaled 8,000 linear feet of 42" wide conveyor,
transporting 2,500 TPH of 8" x 0" raw sand and gravel aggregate
from the pit to the plant. In-depth
project information
More Aggregate
In-pit Crushing and
Overland Conveying Projects
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