Condensed Balance Sheets (USD $)	Jun. 30, 2013	Dec. 31, 2012
CURRENT ASSETS
Cash and cash equivalents	$ 519,571	$ 643,431
United States Treasury securities	6,007,129	8,427,807
Royalties receivable	4,736,398	4,070,111
Prepaid expenses	53,462	2,110
TOTAL CURRENT ASSETS	11,316,560	13,143,459
NONCURRENT ASSETS
United States Treasury securities	3,337,604	4,295,457
PROPERTIES
Mineral and surface lands	39,479,708	39,479,708
Accumulated depletion and amortization	(38,245,177)	(37,897,777)
Mineral and surface lands, net	1,234,531	1,581,931
Building and equipment	335,568	334,538
Accumulated depreciation	(253,012)	(236,671)
Building and equipment, net	82,556	97,867
TOTAL PROPERTIES	1,317,087	1,679,798
TOTAL ASSETS	15,971,251	19,118,714
CURRENT LIABILITIES
Accounts payable and accrued expenses	109,913	104,256
Distributions	3,750,000	7,875,000
TOTAL CURRENT LIABILITIES	3,859,913	7,979,256
NONCURRENT LIABILITIES
Deferred compensation	229,100	229,100
Liability for pension benefits	1,559,514	1,511,694
TOTAL NONCURRENT LIABILITIES	1,788,614	1,740,794
TOTAL LIABILITIES	5,648,527	9,720,050
BENEFICIARIES' EQUITY, including certificate holders' equity, represented by 1,500,000 certificates (shares or units) of beneficial interest authorized and outstanding, and the reversionary interest	12,404,330	11,820,773
Accumulated other comprehensive loss	(2,081,606)	(2,422,109)
TOTAL BENEFICIARIES' EQUITY	10,322,724	9,398,664
TOTAL LIABILITIES AND BENEFICIARIES' EQUITY	$ 15,971,251	$ 19,118,714