KMA应为Kailin Mining Administration,似应译为“开林(音)矿务局”(与今日贵州开磷集团无关,后者”开磷“为开阳磷矿之简称)。
关于这个机构,在网上只找到一个记录:The Kailin Mining Administration (KMA), a British-controlled company, had developed Chinwangtao as a shipping point for its coal mines near Tangshan.(http://www.ibiblio.org/hyperwar/USMC/V/USMC-V-V-2.html)