请专业人士帮忙把这句中文翻译成英文

虽然进口锡精矿在精锡冶炼原料中所占的比例还比较小，但是呈现增加的趋势，并且将在未来保持增加。
Imported tin concentrate accounts for a small proportion of the raw materials in tin smelting, but the proportion is keeping growing.

Although the import tin concentrate mineral at the concentrate tin Ye chain raw material in the proportion had still smaller, present augmentative trend, and will keep increment in the future.
翻译得差不多

Although the proportion of the import of tin concentrate is still small in tin material smelting,it shows a tendency to increase,and it will keep increasing in the future.

首先机翻自重。然后我试着翻译一下，也算不上什么专业人士：
The proportion of imported tin concentrate in raw tin material used for refining, although relatively small at present, appears to be increasing, and this trend will continue in the future.
其中“精锡冶炼原料”颇为不易，我是按照“进行锡的精炼所需的原料”的理解直接翻译的，肯定会有不符合行业术语的地方，应该能找到更准确的说法。
不管怎样，希望能对你有所帮助。