"If drill is ...negative probably down to just above cash...

"If drill is ...negative probably down to just above cash backing my estimate 0.05."

If the above figure is assumed correct, the potential loss on the current share price is estimated at 13.5c-5c = 8.5c/share.

The quoted risk of a duster at Artemis seems to be about 2/3, so someone punting short-term on this well would have to be able to sell at a price greater than three times the sum at risk, or 3 x 8.5 = 25.5c/share, on drilling success.

If you owned a very large number of different stocks, you might be able to justify receiving only a small risked profit above 25.5c, such as a selling price of say 30c/share. However, with a smaller portfolio, the profit margin has to be higher, because there's a rising risk that you'll go broke before the odds average out in your favour. Let's guess that you'd need to make a profit of say 100% over the risked value of the investment, or in other words, a multiplying factor of 2.

So, I'd want to be able to reliably sell for at least 2 x 25.5 = 51c/share if the hole proves to be a reasonable success, based on buying at the current share price of 13.5c.

If, instead, I'd bought in at 20c, I'd be wanting a selling price of at least $0.90.

These are obviously rough figures, particularly the guessed value of 100%. A statistical calculation could be performed that would provide a more accurate value than 100%. Such a calculated value could prove to be either larger or smaller than 100%, for all I know.