Cabot to Resume Tantalum Mining Operation in Canada to Meet Growing Demand

May 12, 2011

Mine offers global customers important "conflict-free" source of tantalum

BOSTON, May 12, 2011 (BUSINESS WIRE) -- Rising global demand for tantalum has caused Cabot Corp. (NYSE: CBT) to announce its intention to resume production of the material at its mining facility in Manitoba, Canada, company officials said today.

Cabot previously suspended production at its TANCO facility in 2009, as part of the company's commitment to manage its capacity to market demand.

"We're pleased to resume production at TANCO," said Andrew O'Donovan, General Manager, Cabot Supermetals business. "We're currently in a period of strong market recovery and growth for tantalum. Our customers know they can count on us to deliver high-performance material, and they know that our raw material is 100-percent conflict-free. "

Cabot is a leading global producer of tantalum powder, a high-performance metal powder most commonly used in electronics capacitors. Tantalum makes capacitors highly efficient and reliable - which in turn makes consumer electronics products such as cell phones and computers smaller and more powerful. Tantalum also enables important advances in chemical and pharmaceutical processing, aerospace, energy and ballistic applications.

Tantalum Mining Corporation of Canada, or "TANCO," is located close to the Whiteshell Provincial Park, about 180 kilometers northeast of Winnipeg and is wholly owned by Cabot.

ABOUT CABOT CORPORATION

Cabot Corporation, headquartered in Boston, Massachusetts, USA, is a global specialty chemical and performance materials company. Cabot's major products are carbon black, fumed silica, inkjet colorants, aerogel, capacitor materials, and cesium formate drilling fluids. The company's website is: www.cabot-corp.com.

Safe Harbor Statement under the Private Securities Litigation Reform Act of 1995:Statements in the press release regarding Cabot's business that are not historical facts are forward looking statements that involve risks and uncertainties.For a discussion of such risks and uncertainties, which could cause actual results to differ from those contained in the forward looking statements, see "Risk Factors" in the Company's Annual Report on Form 10-K.

SOURCE: Cabot Corp.

Cabot Corp.
Susannah Robinson, 617-342-6129
Director, Investor Relations
or
John Shea, 617-342-6254
Manager, Corporate Communications