EX-21 3 d54374exv21.htm SUBSIDIARIES OF THE REGISTRANT exv21
 

Exhibit 21
SUBSIDIARIES OF THE REGISTRANT
         
    State of Incorporation    
Name   or Organization    
Amber Resources Company of Colorado
  Delaware    
 
        
Piper Petroleum Company
  Colorado    
 
        
Delta Exploration Company, Inc.
  Colorado    
 
        
Castle Texas Exploration Limited Partnership
  Texas    
 
        
DPCA, LLC
  Delaware    
 
        
DLC, Inc.
  Colorado    
 
        
DHS Holding Company
  Delaware    
 
        
DHS Drilling Company
  Colorado    
 
        
C&L Drilling Company
  Colorado    
 
        
Chapman Trucking Company
  Wyoming    
 
        
PGR Partners, LLC
  Colorado    
 
        
CRB Partners, LLC
  Delaware    
 
        
Delta Risk Management, LLC
  Colorado    
 
        
Vega Piceance, LLC
  Colorado