* Linc in talks on clean energy business
* Abramovich visited Linc gas-to-liquids plant in Australia
* Linc shares up 5 pct in weaker market (Adds source comment, details)
MELBOURNE, Nov 8 (Reuters) - Russian billionaire Roman Abramovich is considering investing in Australia's Linc Energy , a company that has produced diesel and jet fuel from gas released from underground coal, a person familiar with the talks said on Thursday.
Abramovich, the owner of Chelsea soccer club who made his fortune in Russia's oil industry, has expressed interest in Linc's Clean Energy UCG arm, an underground coal gasification and gas-to-liquids business that converts gas extracted from burning coal deep underground into transport fuels.
"He is particularly interested in the Clean Energy UCG business," the source said, declining to be named as the talks were confidential.
Linc's shares jumped 5 percent on the news and last traded up 3.4 percent at A$0.615, while the broader market was down 1 percent.
The source confirmed a report in the Australian Financial Review newspaper that said Abramovich dined with Linc Energy Chief Executive Peter Bond at a restaurant in Brisbane and had visited Linc's gas-to-liquids plant in Chinchilla, Queensland.
Linc Energy declined to comment.
Under Australian rules, a company would only need to disclose it was in talks on a deal if they were deemed to be material.
Linc Energy has been seeking partners to help commercialise its technology and earlier this year signed a deal with Chinese green power firm GCL Projects to make diesel from coal syngas in China, with GCL taking a 5 percent stake in the firm.
It has also been looking to sell some coal assets in Queensland for more than a year but has had difficulty lining up a buyer due to concerns about rising costs, new taxes and, more recently, higher royalties and uncertainty over coal demand.
Reporting by Sonali Paul; Editing by Richard Pullin