The project name for this block is Silver Bell, AZ 
under contract number 01CRCN0040.

The data projection is UTM zone 12N.

The primary datum used for gridding and map production is WGS-84.  
Coordinates in NAD27 have also been provided in the database.

The base lattitude is 0, the base longitude -111.

The projection scale factor is 0.9996.

The false easting is 500000, the false northing 0.

The grid specific information as contained in the .GXF 
file header is:
                                                                              
#POINTS                                                                         
483                                                                             
#ROWS                                                                           
395                                                                             
#SENSE                                                                          
1                                                                               
#XORIGIN                                                                        
440250                                                                          
#YORIGIN                                                                        
3576900                                                                         
#ROTATION                                                                       
0                                                                               
#PTSEPARATION                                                                   
50                                                                              
#RWSEPARATION                                                                   
50                                                                              
#TRANSFORM                                                                      
1 0