Earlier this month, the AIM-quoted oiler said that operations at the Welch Permian Basin project and the Strawn project had been impacted by recent significant rainfall.
Several wells had to be temporarily shut-in, and, certain regular repair works were delayed as a result of the weather. At the same time, due to impassable roads, some crude collections were delayed.
However, on Monday Mosman said the rain had abated and that it had recently sold four tankers of oil from the Welch Project and two from the Strawn project. It added that further sales were expected before the end of the month.
A number of the wells that were shut in are now producing again, Mosman said, adding that some wells still require minor repairs that will be remedied over the coming weeks.
"As stated, the effect will be a slightly lower average production rate,” said Mosman chairman John W Barr.
“There remain a small number of repairs to be completed at Welch, however the board maintains its belief in a focus on building production,” he added.
Shares in Mosman were 3.5% up at 0.44p in early afternoon trade.