Within the framework of joint field events of the Ministry of Ecology of the Republic of Tatarstan and the Kazan Interdistrict Environmental Prosecutor's Office, compliance with legislation in the field of subsoil use was checked. It is established that in the Yelabuga district, employees of one of the local enterprises illegally carried out unlicensed sand mining for about two years. According to this fact, all the verification materials were sent to the law enforcement agency to resolve the issue of criminal prosecution of the perpetrators. Based on the results of the review, a criminal case under Part 1 of Article 171 of the Criminal Code of the Russian Federation (illegal entrepreneurship) was initiated