Summit Materials

Summit Materials Acquires Kilgore Paving and Maintenance and the Aggregate, Ready-Mix Concrete and Construction Assets of Harper Companies

August 17, 2010, Washington DC - Summit Materials, LLC (Summit), a building materials company, today announced that it has concluded the acquisitions of Kilgore Paving and Maintenance, LLC, an asphalt production and paving company, and the aggregates, ready-mix concrete and construction assets of Harper Companies. Both businesses, which are based in Salt Lake City, Utah, have merged to form Harper-Kilgore, LLC, an integrated materials and construction company. Jason Kilgore, the former owner of Kilgore Paving and Maintenance, LLC will run Harper-Kilgore, LLC post-closing with support from a strong management team across the combined operations.

Tom Hill, CEO of Summit stated, “We are very pleased to form our third regional platform in Salt Lake City, Utah through these acquisitions. Utah is an attractive business environment and we are delighted to establish a position in this market. Harper-Kilgore comprises many skilled and experienced employees and we would like to welcome them all into the Summit group of companies.”

Jason Kilgore remarked, “This marks a significant and exciting development for Harper and Kilgore. The , the two companies complement each other very well.  The  and the combined employee groups brings many skills and synergies to the new Harper-Kilgore company.  We look forward to building upon our existing strengths to further improve our products and services for our customers and community.”

About Summit Materials

Summit Materials was formed in 2009 to develop a leading business in the aggregates and heavy-side building materials sector through strategic acquisitions. Summit Materials was founded by its CEO Tom Hill and a group of investors that include members of its management team, Blackstone Capital Partners V L.P., Silverhawk Capital Partners and Charles "Chip" Goodyear, former CEO of BHP Billiton. Tom Hill is the former CEO of Oldcastle Inc., the US division of CRH, plc. Other Summit companies are Hamm, Inc. in Perry, Kansas (acquired September 2009), Hinkle Contracting Company in Paris, Kentucky (acquired February, 2010), and Cornejo & Sons in Wichita, Kansas (acquired April 2010).

About The Blackstone Group

Blackstone (NYSE:BX) is one of the world's leading investment and advisory firms with total fee-earning assets under management of over $90 billion. Blackstone seeks to create positive economic impact and long-term value for our investors, the companies it invests in, the companies it advises and the broader global economy. Blackstone's alternative asset management businesses include the management of corporate private equity funds, real estate funds, hedge funds, funds of funds, debt funds, collateralized loan obligation vehicles (CLOs) and closed-end mutual funds. The Blackstone Group also provides various financial advisory services, including mergers and acquisitions advisory, restructuring and reorganization advisory and fund placement service. Further information is available at www.blackstone.com.

About Silverhawk Capital Partners

Silverhawk is an independent investment group established in 2005, to invest in management buyouts and other private equity transactions in the Industrial, Energy/Natural Resources and Business Service sectors. The partners of Silverhawk have invested as a team and operated businesses since 1989. Further information is available at www.silverhawkcapitalpartners.com.

For Summit Materials:
Michael Brady
202-339-9509

For Blackstone:
Heather Lucania
212-583-5452

For Silverhawk:
Matt Sheehy
203-861-2905