MMR Research! MMR is a serious research firm that costs $4600 a year to subscribe. This is their discussion about Power Metals. Sinomine Resource Group Co. Ltd, from China, is now the holder of the Tanco mine and Sinclair's reservoirs, but a new potential rival is just surfacing on the cesium picture: Power Metals Corp., a largely unexplored Canadian junior miner better remembered for its significant heavy rock lithium reserve in Canada. With complete ownership of the Case Lake site in Ontario, where it discovered a reservation containing some higher quality cesium ore, this business is standing on what is anticipated to become only the fourth industrial mine of its sort on the entire planet.