Nigerian oil minister returns, doubters circle, Posted by Meosha Eaton

* Stalled oil reforms hold key to unlocking investment

* Refining, gas, Niger Delta are major challenges

* Nigeria has vast latent petroleum potential

By Joe Brock

ABUJA, July 7 - Nigeria's returning oil minister may have the support of the president but with Africa's largest energy industry stalling she will need to show swift progress to prove her critics wrong and attract much-needed investment.

President Goodluck Jonathan showed his faith in Deziani Alison-Madueke, Nigeria's first female oil minister by re-appointing her on Saturday after she spent less than a year in his cabinet prior to April's elections.

Libya imports gasoline from Italy's Saras, Posted by Meosha Eaton

* Transfers gasoline via Tunisia to Libya-bound vessel

* Libya's GNMTC not on U.N. sanctions list

* Italian refiner was major trading partner with Libya

(Updates with Saras statement, adds link to U.N. list, adds links to graphic on Libya's oil and gas industry, oil factbox)

By Jessica Donati and Emma Farge

LONDON, April 26 (Reuters) - Libya imported gasoline from Italian refiner Saras in early April, taking advantage of a loophole in United Nations sanctions that permits purchases by companies not on a U.N. list of banned entities.