英语翻译
我自己翻译的,感觉有点不对啊.请帮我!
This mine is currently and consistenly extracting 1.5% in oxide of copper in addition to the realization of copper every 2.4 meters of perorations.
除了通过每隔2.4米我们得到一定数量的铜之外,我们还可以一直提取到1.5%的氧化铜.
还有一句：
We confirm that we are presently interested in the joint venture development of the mining properties,as opposed to the sale of our properties for royalty purposes only.
我们现在对开展开采铜矿的合资企业很有兴趣,我们不接受对采矿没有特许权的公司的产品.
第二句话的后半句怎么理解啊,尤其是那个royalty.这是有关铜矿的啊.
到底royalty是指的什么啊？期待