Also known simply as Mineral Pitch (the word is closely related to "mumiyah" - Arabic for bitumen.)
There is not a single, commonly accepted English term (shilajeet and mumiyo being the most common), but it is known to those interested in esoteric substances under the above names, and a few others that can be found in Indian, Chinese and Tibetan books on natural medicine. Ayurvedic medicine makes extensive use of it as a natural tonic and sometimes even an aphrodisiac. I used to market mumiyo in the States in the early 80s and I found that the best sources of supply and information on the product were in India. If I look through my archives, I could probably find spectrographic analysis info on the product, listing many of the organic and inorganic substances found in it, some of them rather toxic (arsenic, mercury, etc.)