Siljan Ring proved inconclusive. Drilling for natural gas was resumed in the late 2000s and continues as of mid-2012. The scientific premise for prospecting of this sort is based on the work of physicist Vladimir Kutcherov, who is cooperating with Igrene, the company financing the drilling operations. Siljan Ring The Siljan Ring () is a prehistoric impact crater in Dalarna, central Sweden. It is one of the 15 largest known impact craters on Earth and the largest in Europe, with a diameter of about . The impact that created the Siljan Ring occurred when a meteorite collided with the Earth's surface during
Doctor Mora Doctor Mora Doctor Mora is a Mexican city (and municipality) located in Northeast region of the state of Guanajuato. The municipality has an area of 233.91 square kilometres (0.77% of the surface of the state) and is bordered to the north by Victoria, to the east by Tierra Blanca, to the south by San José Iturbide, and to the west by San Luis de la Paz. The municipality has a population of 24,976 according to the 2015 census. Doctor Mora is named after José María Luis Mora. The municipal president of Doctor Mora and its many smaller outlying communities is