Gilsonite? Are you talking about the bituminous material? It's composition is incredibly complex; thin layer will not give you the resolution required to separate the components.
Asphaltum (asphalt, bitumen) contains a number of polar and non-polar compounds. It is generally soluble in toluene.
For TLC, I'd use hexane/toluene and hexane/dichloromethane solvent system on alumina columns, and use more polar solvents if needed. Silica TLC doesn't seem to work as well for bitumen.
For ionizable compounds, they can be isolated with ion exchange as described in this poster:
http://www.teledyneisco.com/en-us/liquidChromatography/Chromatography%20Documents/Posters/Isolation%20of%20Ionizable%20Compounds%20from%20Bitumens%20Poster.pdf#search=bitumen
i want to know if i have a mixture in which Asphaltum is present, and i want to identify it with TLC what is the method of analysis for this identification?
Bitumen comes from many different places, so there is some variation in composition. There may be some common components that you could look for but you would need standards for those.
Do a literature search on asphalt, bitumen, tar as these are all names for bitumen.
Look for published methods of bitumen analysis by TLC-FID technique. You will use a normal phase separation with silica gel as stationary phase and step elution with 3 solvents hexane, toluene and dichloromethane/methanol mixture.
In addition of a nice answer from Jack, you can search in TLC Camag TLC data base
http://www.camag.com/en/tlc_hptlc/customer_magazine_cbs/ccbs_database.cfm?method=query
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