User talk:180.190.159.7

June 2013
Hello, I'm Yintan. I wanted to let you know that I undid one of your recent contributions, such as the one you made with this edit to Mineral economics, because it didn’t appear constructive to me. If you think I made a mistake, or if you have any questions, you can leave me a message on my talk page. Thanks.  Yinta n  10:32, 12 June 2013 (UTC)