EX-3
from SC 13D
1 page
Exhibit C Joint Filing Agreement This Joint Filing Agreement (This "Agreement") Is Made and Entered Into as of the 16th Day of July, 1999, by and Among the Undersigned Parties. in Accordance With Rule 13d-1(k)(1) Under the Securities Exchange Act of 1934, as Amended, the Undersigned Agree to the Joint Filing on Behalf of Each of Them of a Statement on Schedule 13d (Including Amendments Thereto) With Respect to the Common Stock of Costilla Energy, Inc., a Delaware Corporation, and Further Agree That This Agreement Be Included as an Exhibit to Such Joint Filing (Including Amendments Thereto). Each of the Persons Named Below Acknowledges That the Information Contained in the Statement on Schedule 13d (Including Amendments Thereto) Respecting Such Person Is Complete and Accurate in All Material Respects and That Such Person Does Not Know and Has No Reason to Believe That the Information Respecting Any Other Person Named Below Is Inaccurate. in Witness Whereof, the Undersigned Have Executed This Agreement as of the Date First Above Written. Prize Energy Resources, L.P. Prize Operating Company By: Prize Operating Company, General Partner By: /S/ Philip B. Smith By: /S/ Philip B. Smith Philip B. Smith Philip B. Smith Chairman and Chief Chairman and Chief Executive Officer Executive Officer Prize Energy Corp. By: /S/ Philip B. Smith Philip B. Smith Chairman and Chief Executive Officer
12/34/56
