Mining company Stratmin Global Resources said strong sales continued through late summer and autumn.The group added that 140 tonnes of graphite were produced in November, with two further units expected to arrive at the Madagascar site in December."As this announcement demonstrates, sales of product have continued throughout the late summer and autumn," Manoli Yannaghas, the group managing director, said in a statement."Our product is increasingly satisfying market requirements, as such November sales are showing a sales similar pattern."November has been a solid month for production demonstrating the potential for the company in the very near term."The firm added that it exported 220 tonnes of graphite to its customers during the three months from August to October and said production volumes were increasing."Our grades and volumes are continuing to improve and consequently the price we are receiving for the product is increasing," said Yannaghas."We are very excited about the working relationship with our partners who are assisting our production efforts at every turn."Stratmin shares were up 5.78% to 6.61p at 14:46 on Monday.