EXHIBIT 21

SUBSIDIARIES OF REGISTRANT

Registrant has no parent; see proxy statement for Registrant’s principal shareholders.  The following are Registrant’s subsidiaries included in the consolidated financial statements:

Name of Subsidiary (Each Owned 100% by Registrant Except as Otherwise Stated)		State or Other Jurisdiction of Incorporation
Castle Concrete Company		Colorado
Continental Catalina, Inc.*		Arizona
Continental Copper, Inc.		Arizona
Continental Quicksilver, Inc.		Idaho
Continental Uranium, Inc.		Colorado
Edens Industrial Park, Inc.		Illinois
McKinney Door and Hardware, Inc.**		Colorado
Phoenix Manufacturing, Inc.		Arizona
ProSoft International, Inc.**		Colorado
Rocky Mountain Ready Mix Concrete, Inc.		Colorado
Transit Mix Concrete Co.		Colorado
Transit Mix of Pueblo, Inc.		Colorado
Williams Furnace Co.		Delaware

* owned by Continental Copper, Inc.

**owned by Transit Mix Concrete Co.