RIO Tinto's uranium subsidiary Energy Resources of Australia has had another rain-drenched quarter and flagged ongoing production problems at its Northern Territory mine.

But the embattled miner, which mines uranium at Ranger within the boundaries of Kakadu National Park, has beaten its production guidance, leading to a 6 per cent jump in its share price yesterday.

ERA said it produced 1030 tonnes of uranium in the fourth quarter, down 12 per cent from a year earlier.

That brought full-year production to 2641 tonnes, slightly above guidance of 2600 tonnes.

ERA shares, with little to support them in the past month, jumped 7.5c to $1.255 after the company hit its latest target, but remain down 80 per cent in the past year. The company, 68 per cent owned by Rio, said record December rainfall meant it had been unable to fully drain one of its mining pits, preventing access to higher grade ore it had been preparing to mine.

"The delay in obtaining access to the high-grade ore located towards the bottom of pit three may impact production of uranium oxide in 2012, however the extent of the impact is presently uncertain," ERA said. Full-year production guidance would be provided next month, it said.

UBS analysts are forecasting ERA will produce 4060 tonnes of uranium this year.

ERA's low production last year followed a five-months plant shutdown after heavy rains filled its tailing dam.