To provide open access, Coal Science and Technology has an open access fee (also known as an article publishing charge, APC) which needs to be paid by the authors or by their research funder or institution. For accepted manuscripts should pay RMB 500 yuan for each printed page, and no reviewing fee for each paper. Authors who require more information (e.g., about waivers or discounts as provided by the journal), please contact the editorial office (E-mail: mtkxjs@vip.163.com).