This state-of-the-art crushing installation is located in Maryland. Construction
began in February 2004 and every effort went into making this large quarry
a sterling example of an environmentally conscious, model business operation
in this community. The construction phase lasted approximately 2 years.
The plant design was a collaborative effort between Steel Systems Installation,
Inc. and Laurel Sand & Gravel (LS&G) in which approximately fifteen
different layout and flow options were considered. All crushing and
screening equipment was selected by evaluating quality, durability, manufacturers
support, and production capabilities. SSI designed, fabricated, and
installed all of the plant structures, conveyors, transfer chutes and coordinated
subcontracting of the foundations and electrical wiring.
The primary jaw plant began start-up in October 2005 and immediately
started producing the base material necessary to construct the entire site.
The primary structure is designed to accommodate a second jaw crusher which
will be installed as sales demands increase. The tertiary plant began
operation in June 2006. Both plants have automated wet dust suppression
systems and the tertiary also has two dry dust collection systems.
Both crushing stations are fully automated and can be operated by just
The high volume crushing installation is designed to produce 1500 TPH
through the primary jaw, and 1200 TPH through the tertiary plant
The plant flow is described below:
Rock is loaded by two 17 cubic yard loaders and hauled up to the primary
hopper by four 100 ton trucks.
Material is passed over a vibrating grizzly feeder. Any oversize
is handled by a hydraulic pedestal boom with breaker.
The pass thru of the Vibrating grizzly feeder goes to a three deck screen
which allows Class I, gabion, #2, or CR6 to be pulled, if desired with
stackers. Hydraulic gates allow none, some or all of any deck to
be pulled or returned to the secondary crushers or to the tertiary surge.
Everything from the secondary crushers goes to the live 6,000 ton tertiary
Within the tertiary surge tunnel are five feeders. One can be used
to return material to the primary jaw. The other four can be used
to charge the overland belt which feeds another 3 deck screen.
Through the use of hydraulic gates the company can make gabion, #2, and
1 ½” CR6. In under this station is a reversing belt which,
when reversed, allows the 1 ½” material to be sent to a GAB circuit.
At this station, two options are available with the use of a 2 deck high
frequency screen and finger gates - GAB or 3/16” dust. Currently the company
is making #57, some #8s, some #7s, and CR6 or 3/16” dust.
The oversize is returned to one quaternary crusher.
All products are stacked with radial stackers in stockpiles ranging from
20,000 to 55,000 to 65,000 tons.