CIMRM 88 - Tauroctony. Sî`, Syria
The relief was discovered in 1916, and published by Butler, who had excavated it in the ruins of a temple of Dushara (Dusares) at Sî` (Seeia, modern Djebel Druze) in the Haurân, near Kenawât, the ancient Kanatha.1
It does not seem that the Mithraeum was discovered.
Note that the snake is not licking the blood, but drinking the semen of the bull. See also the smashed Tauroctony relief in the Damascus National Museum.
See also CIMRM fig. 33 for a (not very good) photograph.