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Representative Projects

Superior Silica Quarry, Ash Grove Cement Company, Enumclaw, Washington

Mr. Bennett became involved with this industrial silica quarry in 1998 after it had operated for several years and had nearly exhausted the identified reserves. Additional silica reserves were identified through drilling and geologic mapping, and a three phased mining and reclamation plan was designed by Mr. Bennett and approved by King County and Washington DNR. Segmental mining and reclamation was conducted from 1998 to 2004. The site was fully reclaimed in 2004 under Mr. Bennett’s supervision and has reverted to forest production.



The Superior Quarry in 2004 as it appeared at the end of mining. Note that segmental
reclamation had already taken place at the south (left) side of the property.
Stored topsoil lies on the north (right) side of the mine.



Topsoil replacement at Superior Quarry in 2004



Following topsoil replacement trees were planted at a density of 435 stems per acre



Revegetation completed summer of 2004



Successfully reverted to forest production by 2008


Reserve Silica Quarry, Reserve Industries, Ravensdale, Washington

The Reserve Silica Quarry had operated since the late 1960’s producing silica sand for glass manufacturing. The site had long since mined past its originally permitted boundaries by the time Mr. Bennett became involved with the operation in 2001. King County, under its 5-year review authority, mandated that updated permits be obtained for the site. Mr. Bennett, with a team of other engineers and scientists prepared a comprehensive document that fulfilled the requirements of King County. Studies included wetland and sensitive areas, traffic, noise, and slope stability, as well as a comprehensive hydrogeologic investigation by Mr. Bennett. An updated surface mine reclamation permit was also prepared for Washington DNR and an NPDES permit for Washington DOE.



Deepening the pit at Reserve Silica. Note the steeply dipping coal seams


Cascade Quarry, Resource Land Holdings, Gold Bar, Washington

The Cascade Quarry had operated as the Miller Lime Quarry since the 1930’s. The site had been given a notice of correction order by DNR in 2004 for mining outside its permit boundaries and for mining practices that could lead to an unsafe site. Subsequent to the compliance orders the site was purchased by the present owner and Bennett Consulting became involved in early 2007. Mr. Bennett prepared a revised integrated mine and backfill plan that included systematic mine benching and reclamation of out-of-permit mined areas. After reviewing the revised mine plan Snohomish County granted a grandfathered non conforming use approval for the site. With County approval a revised DNR surface mine reclamation permit and DOE NPDES permit were prepared for the site.


Systematic mine bench development now taking place at Cascade Quarry


White River Aggregates Quarry, Glacier Northwest, Enumclaw, Washington

Mr. Bennett completed the geologic characterization and stratigraphic analysis for the development of the White River Aggregates quarry. Within the project area, two of the distinct volcanic units identified at the site were judged suitable for rock quarry operations and further testing. Follow up drilling was carried out in the most favorable areas for quarry development and the site has now been in production for nearly 12 years.

Mats Mats Quarry, Glacier Northwest, Port Ludlow, Washington

Mr. Bennett completed a geologic characterization and reserve estimation of an existing quarry operation for a proposed expansion. Stratigraphic and structural geologic mapping was completed to direct hydrogeologic testing and modeling. The site is located on a small rock peninsula with operations extending to below tidewater. The geologic studies indicated that the site could be safely developed and that expansion would not also impact neighboring water wells.

Cedar River Watershed, City of Seattle, North Bend, Washington

The City of Seattle maintains a number of rock quarries and gravel pits at their Cedar River Watershed for internal use on their existing road system. Mr. Bennett designed long term development and reclamation plans for the active mine sites so that they would meet DNR reclamation requirements as well as MSHA safety guidelines

Castle Rock Kaolinite Quarry, Ash Grove Cement Company, Castle Rock Washington

This claystone quarry had been in production on an intermittent basis since the 1930’s, however the site had never been permitted by either County or State agencies. Mr. Bennett designed and supervised the final reclamation of the site so that it could revert to forest production. Following reclamation DNR personnel were brought to the site and they provided written documentation to the landowner that the reclamation met State Standards.

Sunset Quarry, C. Wyss and Sons, Wilkeson, Washington

Mr. Bennett served as the project manager for the development of a new aggregate quarry and gravel mine in Pierce County, Washington. Permits included a County Conditional Use Permit, Mineral Resource Rezone, a DNR surface mine reclamation permit and DOE NPDES permit.

Lummi Island Quarry, Ace Rock, Lummi Island Washington

Mr. Bennett completed a rock slope stability analysis of this operation at the request of DNR mine inspectors. At this site steeply dipping, foliated, marine basalt rocks had been undermined at the base of a mine highwall to the point of risking rock slope failure. An analysis of failure planes was carried out with recommendations provided for systematic mine bench development, along with backfilling recommendations for the undermined areas.

WASHINGTON STATE SURFACE MINE RECLAMATION PERMITS FOR OTHER MINES

Mr. Bennett prepared surface mine reclamation permits for the following operations in Washington State for the Department of Natural Resources:

• Far Point Sand and Gravel Mine, Resource Land Holdings, Granite Falls, Washington
• Bear Creek Gravel Mine, Peninsula Topsoil, Belfair, Washington
• Franklin Ridge Gravel Mine, Interwest Construction and Development, Enumclaw, Washington
• Hope Creek Quarry, Rock Services, Inc., Chehalis, Washington
• Meridian Hill Quarry, The Agnew Company, Centralia, Washington
• Lake Francis Sand and Gravel Mine, Quality Rock Products, Maple Valley, Washington
• Littlerock Sand and Gravel Mine, Quality Rock Products, Olympia, Washington
• Maytown Aggregates, Citifor, Maytown, Washington
• Dallesport Rock Pit, Port of Klickitat, Dallesport, Washington
• Snoqualmie 5-Mile Pit, Hos Bros. Construction, Woodinville, WA
• Riverscene Sand and Gravel, Wilder Construction, Granite Falls, Washington
• Quincy Rock Sand and Gravel, Interwest Development, Quincy Washington
• Cedar Mountain Gravel Mine, Procon Construction, Maple Valley, Washington

INDUSTRIAL SILICA QUARRIES ON FEDERAL LAND

Mr. Bennett has directed the development of the following industrial silica mines in Nevada

• Kramer Hill Silica Quarry, James Hardie Building Products, Golconda, Nevada
• Stone Corral Silica Quarry, James Hardie Building Products, Humboldt County, Nevada
• Lucky Boy Silica Quarry, James Hardie Building Products, Mineral County, Nevada

METAL MINES AND OTHER PROJECTS

Red Top and Combination Gold Mines - Red Rock Mining, Inc. Goldfield, Nevada

Mr. Bennett directed the design and development of two open quarry gold mines in the Goldfield District of western-central Nevada. The development work included exploration and delineation drilling, ore reserve estimations, mine planning and metallurgical testing. The day to day operations work consisted of surveying, drilling and blasting, assaying, ore/waste extraction, crushing and agglomerating of gold ore, followed by gold recovery using an activated carbon/electrowin circuit. Gold dore’ was poured on site and sold to a refiner. Exploration drilling, reserve estimations, metallurgical testing and economic evaluations were also conducted on neighboring prospects and elsewhere in western Nevada.

Winston Lake Mine – Corporation Falconbridge Copper, Schreiber, Ontario, Canada

Mr. Bennett was part of a geologic team directing the surface and underground delineation drilling of a polymetallic massive sulfide Cu-Zn-Ag-Au orebody to determine the economic viability of an underground mining operation. The program successfully outlined four million tons of sulfide ore that was placed into production at a rate of 2,000 tons per day. The complex sulfide ore was concentrated on site using a conventional flotation mill, with concentrates sent to eastern Canada for smelting.

Green Mountain Prospect – Nevcan Exploration, Mariposa County, California

Mr. Bennett directed the delineation drilling of a five million-ton polymetallic massive sulphide occurrence in the southern Sierra foothills of California. The prospect has never been developed due to environmental permitting considerations.

Shadow Mountains Tungsten Skarn Prospect – Nevcan Exploration, Mojave County, California

Mr. Bennett supervised the geologic mapping, geophysical and lithogeochemcial surveys, and follow-up percussion drilling of a scheelite skarn deposit near Victorville, California. The program delineated a near surface, approximate half million ton orebody that was amenable to open pit surface mining methods.

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