Junior uranium explorer Toro Energy has doubled the uranium resource at its Napperby project in the Northern Territory.

The new resource at Napperby, 150km north-west of Alice Springs, totals 4.6 million tonnes at 305 parts per million uranium oxide, containing 1,420 tonnes of uranium oxide, and is in the inferred category of Australia's mineral reporting code, JORC.

The results from further exploration and resource evaluation will feed into a scoping study and another resource update, which is expected by November.

Toro managing director Greg Hall said the new resource was a shallow deposit, with mineralisation extending well beyond the currently defined resource.

"The mineralisation is less than eight metres below surface and should lend itself very favourably to selective mining," Mr Hall said.

Toro has an option to purchase the project from fellow uranium explorer Deep Yellow Ltd after evaluating the resource and economics over a three-year period.

At 1418 AEST, Toro's shares were half a cent higher at 22.5 cents.