Pit & Quarry, February 2017
ExtrEmE opEn arEa How a Colorado operation meets high demand where throughput is king BY CaroL WaSSon ggregate Industries AIUS is one of the largest construction and building material companies in the United States The company stresses strategic sustainability environmental stewardship and long term customer relationships Its 3 million tpy Morrison Quarry is a granite operation that illustrates that mission As a site within the AIUS West Central Region the Morrison Quarry is in Jefferson County Colorado which is one of three counties in the six county Denver region that offers available sources of crushed stone As many of the potential aggregate resources in the Denver area are not accessible for extraction the Morrison Quarry plays a key role in meeting the regions demand for high quality aggregate materials Throughput is everything says Trulane Vanatta plant manager of the Morrison Quarry He operates a sold out plant Everything processed on a given day is sold the next Thus the facility maintains a consistent focus on boosting processing efficiency and production capacity To eliminate any bottlenecks at the screening circuits particularly the Morrison Quarry team recently tapped into the engineering expertise at Polydeck Screen Corp The result was the design and installation of DMax screen panels a new ultra highopen area synthetic screen media system that is designed to boost throughput and allows the quarry to increase the production of its highest value products RedUcIng RecIRcUlATIng loAds And fInes PRodUcTIon Prior to the DMax screen panel installation the quarry had identified a bottleneck in the middle decks of the three screens in the tertiary circuit of the nine screen plant Each of the 8 ft x 20 ft triple deck screens is key to the production of 57 67 1 in material Thats our money maker and we must maximize its production volume says Vanatta whose team had taken belt samples that indicated a high bed depth on the middle decks There was a troubling 51 percent carryover causing recirculating loads and the production of excessive fines The first thing we thought of was replacing the middle decks on two of the tertiary screens with wire cloth to achieve more open area Vanatta says pitandquarry com February 2017 PIT QUARRY 37 PhotoS courteSy of Polydeck Screen corP A scReenIng
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