Exhibit 99A

SCHEDULE I

Name, business address, present principal occupation or employment and place of
citizenship of the directors and executive officers of SCIA and Cimcap

In accordance with the provisions of General Instruction C to Schedule 13D, the name of each director, executive officer, if applicable, or other person controlling Schweizerische Cement-Industrie-Aktiengesellschaft (“SCIA”) and Cimcap AG (“Cimcap”), together with their citizenship and present principal occupation or employment (and the name, principal business and address of any corporation or other organization in which such employment is conducted) is set forth below.

Unless otherwise indicated, the business address of each director and executive officer is Zürcherstrasse 156, 8645 Rapperswil-Jona, Switzerland.

SCHWEIZERISCHE CEMENT-INDUSTRIE-AKTIENGESELLSCHAFT

DIRECTORS

EXECUTIVE OFFICERS

CIMCAP AG

DIRECTORS