Barnwell Industries Inc. posted a fiscal fourth-quarter loss that was more than tenfold wider than the year-earlier period primarily due to a $4.8 million reduction in the value of its oil and natural gas properties, joint venture investments and lot acquisition rights.

The Honolulu-based company said Monday it had a loss of $5.5 million, or 67 cents a share, in the period ended Sept. 30. That compared with a loss of $533,000, or 6 cents a share, in the year-earlier period.

Revenue tumbled 32 percent to $6 million from $8.9 million.

Barnwell said also contributing to its fourth-quarter loss was a 44 percent decline in natural gas prices and a $657,000 increase in stock appreciation rights expenses.

For the full year, Barnwell had a loss of $10.1 million, or $1.22 a share, versus a loss of $109,000, or 1 cent a share, in fiscal 2011. Revenue for the year slipped 11.4 percent to $34 million from $38.5 million.

The company, which gets the majority of its revenue from its oil and natural gas operations in Alberta, also has ownership stakes in Hawaii island resort property and statewide water-drilling operations.

Morton Kinzler, chairman and CEO of Barnwell, said the company’s financial position is “solid,” and it had $8.8 million in cash and cash equivalents at the end of the fiscal year. He said the company was able to repay $6.6 million in long-term debt last year.

Barnwell’s stock slipped 15 cents, or 4.5 percent, to $3.20 Monday on the American Stock Exchange. The results were announced before the market opened.