As filed with the Securities and Exchange Commission on July 25, 2005 Registration No. 333-103027 UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 POST-EFFECTIVE AMENDMENT NO. 4 TO FORM S-1 REGISTRATION STATEMENT UNDER THE SECURITIES ACT OF 1933 Abraxas Petroleum Corporation Grey Wolf Exploration Inc. Sandia Oil & Gas Corporation Sandia Operating Corp. Wamsutter Holdings, Inc. Western Associated Energy Corporation Eastside Coal Company, Inc. (Exact Name of Registrant as Specified in its Charter) Nevada 1331 74-2584033 Alberta 1331 N/A Texas 1331 74-2368968 Texas 1331 74-2468708 Wyoming 1331 74-2897013 Texas 1331 74-1937878 Colorado 1331 74-2275407 (State or other (Primary Standard Industrial (I.R.S. Employer jurisdiction of Classification Code Number) Identification Number) incorporation or organization) 500 North Loop 1604 East, Suite 100, San Antonio, Texas 78232, (210) 490-4788 (Address, including zip code, and telephone number, including area code, of registrant's principal executive offices) Robert L. G. Watson President and Chief Executive Officer Abraxas Petroleum Corporation 500 North Loop 1604 East, Suite 100 San Antonio, Texas 78232 (210) 490-4788 (Name, address, including zip code, and telephone number, including area code, of agent for service) With a copy to: Cox Smith Matthews Incorporated 112 East Pecan, Suite 1800 San Antonio, Texas 78205 Attn: Steven R. Jacobs Jeffrey C. Gifford (210) 554-5500 APPROXIMATE DATE OF COMMENCEMENT OF PROPOSED SALE TO THE PUBLIC: As soon as practicable after this registration statement becomes effective. If any of the securities being registered on this Form are to be offered on a delayed or continuous basis pursuant to Rule 415 under the Securities Act, check the following box: [x] If this Form is filed to register additional securities for an offering pursuant to Rule 462(b) under the Securities Act, check the following box and list the Securities Act registration statement number of the earlier effective registration statement for the same offering. [ ] If this Form is a post-effective amendment filed pursuant to Rule 462(c) under the Securities Act, check the following box and list the Securities Act registration statement number of the earlier effective registration statement for the same offering. [ ] If this Form is a post-effective amendment filed pursuant to Rule 462(d) under the Securities Act, check the following box and list the Securities Act registration statement number of the earlier effective registration statement for the same offering. [ ] If delivery of the prospectus is expected to be made pursuant to Rule 434, please check the following box. [ ] DEREGISTRATION OF SECURITIES In accordance with the registrant's undertaking set forth in the registration statement, effective as of the date and time that this post-effective amendment no. 4 is declared effective, the registrant hereby deregisters such securities that were registered on the registration statement but were not sold under the registration statement. SIGNATURES Pursuant to the requirements of the Securities Act of 1933, the undersigned registrant has duly caused this registration statement to be signed on its behalf by the undersigned, thereunto duly authorized, in the City of San Antonio, Texas, on July 25, 2005. ABRAXAS PETROLEUM CORPORATION By: -------------------------------------------- Robert L. G. Watson, Chairman of the Board, President and Chief Executive Officer Pursuant to the requirements of the Securities Act of 1933, this registration statement has been signed below by the following persons in the capacities and on the date indicated. Signature Name and Title Date --------- -------------- ---- * Chairman of the Board, July 25, 2005 -------------------------------- President, Chief Executive Robert L. G. Watson Officer(Principal Executive Officer), and Director of Abraxas Petroleum Corporation * Executive Vice President, July 25, 2005 -------------------------------- Chief Financial Officer, Chris E. Williford Treasurer (Principal Financial and Accounting Officer)of Abraxas Petroleum Corporation * Director of Abraxas July 25, 2005 -------------------------------- Petroleum Corporation Craig S. Bartlett, Jr. * Director of Abraxas July 25, 2005 -------------------------------- Corporation Franklin A. Burke * Director of Abraxas July 25, 2005 -------------------------------- Corporation Harold D. Carter * Director of Abraxas July 25, 2005 -------------------------------- Corporation Ralph F. Cox * Director of Abraxas July 25, 2005 -------------------------------- Corporation Barry J. Galt * Director of Abraxas July 25, 2005 -------------------------------- Corporation Dennis E. Logue * Director of Abraxas July 25, 2005 -------------------------------- Corporation James C. Phelps * Director of Abraxas July 25, 2005 -------------------------------- Corporation Joseph A. Wagda *By: -------------------------- Chris E. Williford Attorney-in-fact SIGNATURES Pursuant to the requirements of the Securities Act of 1933, the undersigned registrant has duly caused this registration statement to be signed on its behalf by the undersigned, thereunto duly authorized, in the City of San Antonio, Texas, on July 25, 2005. SANDIA OIL & GAS CORPORATION By: -------------------------------------------- Robert L. G. Watson, President Pursuant to the requirements of the Securities Act of 1933, this registration statement has been signed below by the following persons in the capacities and on the date indicated. Signature Name and Title Date --------- -------------- ---- President(Principal Executive July 25, 2005 -------------------------------- Officer) and Director of Robert L. G. Watson Sandia Oil & Gas Corporation Vice President (Principal July 25, 2005 -------------------------------- Financial and Accounting Chris E. Williford Officer)and Director of Sandia Oil & Gas Corporation Vice President and Director of July 25, 2005 -------------------------------- Sandia Oil & Gas Corporation Robert W. Carrington, Jr. SIGNATURES Pursuant to the requirements of the Securities Act of 1933, the undersigned registrant has duly caused this registration statement to be signed on its behalf by the undersigned, thereunto duly authorized, in the City of San Antonio, Texas, on July 25, 2005. SANDIA OPERATING CORP. By: -------------------------------------------- Robert L. G. Watson, President Pursuant to the requirements of the Securities Act of 1933, this registration statement has been signed below by the following persons in the capacities and on the date indicated. Signature Name and Title Date --------- -------------- ---- President(Principal Executive July 25, 2005 -------------------------------- Officer) and Director Robert L. G. Watson of Sandia Operating Corp. Vice President (Principal July 25, 2005 -------------------------------- Financial and Accounting Chris E. Williford Officer) and Director of Sandia Operating Corp. Vice President and Director July 25, 2005 -------------------------------- of Sandia Operating Corp. Robert W. Carrington, Jr. SIGNATURES Pursuant to the requirements of the Securities Act of 1933, the undersigned registrant has duly caused this registration statement to be signed on its behalf by the undersigned, thereunto duly authorized, in the City of San Antonio, Texas, on July 25, 2005. WAMSUTTER HOLDINGS, INC. By: -------------------------------------------- Robert L. G. Watson, President Pursuant to the requirements of the Securities Act of 1933, this registration statement has been signed below by the following persons in the capacities and on the date indicated. Signature Name and Title Date --------- -------------- ---- President(Principal July 25, 2005 -------------------------------- Executive Officer) Robert L. G. Watson and Director of Wamsutter Holdings, Inc. Vice President(Principal July 25, 2005 -------------------------------- Financial and Accounting Chris E. Williford Officer) and Director of Wamsutter Holdings, Inc. Vice President and July 25, 2005 -------------------------------- Director of Wamsutter Robert W. Carrington, Jr. Holdings, Inc. SIGNATURES Pursuant to the requirements of the Securities Act of 1933, the undersigned registrant has duly caused this registration statement to be signed on its behalf by the undersigned, thereunto duly authorized, in the City of San Antonio, Texas, on July 25, 2005. WESTERN ASSOCIATED ENERGY CORPORATION By: -------------------------------------------- Robert L. G. Watson, President Pursuant to the requirements of the Securities Act of 1933, this registration statement has been signed below by the following persons in the capacities and on the date indicated. Signature Name and Title Date --------- -------------- ---- President (Principal July 25, 2005 -------------------------------- Executive Officer) and Robert L. G. Watson Director of Western Associated Energy Corporation Vice President(Principal July 25, 2005 -------------------------------- Accounting Officer) and Chris E. Williford Director of Western Associated Energy Corporation Vice President and Director July 25, 2005 -------------------------------- of Western Associated Energy Robert W. Carrington, Jr. Corporation SIGNATURES Pursuant to the requirements of the Securities Act of 1933, the undersigned registrant has duly caused this registration statement to be signed on its behalf by the undersigned, thereunto duly authorized, in the City of San Antonio, Texas, on July 25, 2005. EASTSIDE COAL COMPANY, INC. By: -------------------------------------------- Robert L. G. Watson, President Pursuant to the requirements of the Securities Act of 1933, this registration statement has been signed below by the following persons in the capacities and on the date indicated. Signature Name and Title Date --------- -------------- ---- President(Principal July 25, 2005 -------------------------------- Executive Officer) Robert L. G. Watson and Director of Eastside Coal Company, Inc. Vice President(Principal July 25, 2005 -------------------------------- Accounting Officer) and Chris E. Williford Director of Eastside Coal Company, Inc. Vice President and Director July 25, 2005 -------------------------------- of Eastside Coal Company, Inc. Robert W. Carrington, Jr. SIGNATURES Pursuant to the requirements of the Securities Act of 1933, the undersigned registrant has duly caused this registration statement to be signed on its behalf by the undersigned, thereunto duly authorized, in the City of San Antonio, Texas, on July 25, 2005. GREY WOLF EXPLORATION INC. By: -------------------------------------------- Robert L. G. Watson, President Pursuant to the requirements of the Securities Act of 1933, this registration statement has been signed below by the following persons in the capacities and on the date indicated. Signature Name and Title Date --------- -------------- ---- Chairman, Chief Executive July 25, 2005 -------------------------------- Officer (Principal Executive Robert L. G. Watson Officer) and Director of Grey Wolf Exploration Inc. President, Chief Operating July 25, 2005 -------------------------------- Officer and Director of Vincent J. Tkachyk Grey Wolf Exploration Inc. Chief Financial Officer July 25, 2005 -------------------------------- (Principal Financial and Francis T. W. Cheung Accounting Officer) of Grey Wolf Exploration Inc. Director of Grey Wolf July 25, 2005 -------------------------------- Exploration Inc. John B. Maher Director of Grey Wolf July 25, 2005 -------------------------------- Exploration Inc. James C. Smith Director of Grey Wolf July 25, 2005 -------------------------------- Exploration Inc. Mark R. Smith Director of Grey Wolf July 25, 2005 -------------------------------- Exploration Inc. Murray B. Todd