Condensed Balance Sheets (USD $)	Mar. 31, 2013	Dec. 31, 2012
CURRENT ASSETS
Cash and cash equivalents	$ 997,424	$ 643,431	[1]
United States Treasury securities	4,829,247	8,427,807	[1]
Royalties receivable	4,434,172	4,070,111	[1]
Prepaid expenses	75,761	2,110	[1]
TOTAL CURRENT ASSETS	10,336,604	13,143,459	[1]
NONCURRENT ASSETS
United States Treasury securities	3,322,818	4,295,457	[1]
PROPERTIES
Mineral and surface lands	39,479,708	39,479,708	[1]
Less: Allowances for accumulated depletion and amortization	(38,071,477)	(37,897,777)	[1]
Mineral and surface lands, net	1,408,231	1,581,931	[1]
Building and equipment	334,538	334,538	[1]
Less: Allowances for accumulated depreciation	(247,670)	(236,671)	[1]
Building and equipment, net	86,868	97,867	[1]
TOTAL PROPERTIES	1,495,099	1,679,798	[1]
TOTAL ASSETS	15,154,521	19,118,714	[1]
CURRENT LIABILITIES
Accounts payable and accrued expenses	130,056	104,256	[1]
Distributions	3,375,000	7,875,000	[1]
TOTAL CURRENT LIABILITIES	3,505,056	7,979,256	[1]
NONCURRENT LIABILITIES
Deferred compensation	229,100	229,100	[1]
Liability for pension benefits	1,535,604	1,511,694	[1]
TOTAL NONCURRENT LIABILITIES	1,764,704	1,740,794	[1]
TOTAL LIABILITIES	5,269,760	9,720,050	[1]
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	12,136,619	11,820,773	[1]
Accumulated other comprehensive loss	(2,251,858)	(2,422,109)	[1]
TOTAL BENEFICIARIES' EQUITY	9,884,761	9,398,664	[1]
TOTAL LIABILITIES AND BENEFICIARIES' EQUITY	$ 15,154,521	$ 19,118,714	[1]

[1] The balance sheet at December 31, 2012, has been derived from the audited financial statements at that date but does not include all of the information and footnotes required by generally accepted accounting principles for complete financial statements.