Would this have something to do with his decision?
Mineral resources
Extensive surveys have revealed the existence of a number of minerals of economic importance. The most important discovery has been that of natural gas, with large reserves near Sheberghan in Jowzjan province, near the Turkmen border, about 75 miles west of
Mazar-e Sharif. The Khvajeh Gugerdak and Yatim Taq fields are major producers, with storage and refining facilities. Pipelines deliver natural gas to Uzbekistan and Tajikistan and to a thermal power plant and chemical fertilizer plant in Mazar-e Sharif. Petroleum resources have proved to be insignificant. Many coal deposits have been found in the northern slopes of the Hindu Kush. Major coal fields are at Karkar and Eshposhteh, in Baghlan province, and Fort Sarkari, in Balkh province.
High-grade iron ore, with an iron content of 62-63 percent, has been discovered at Hajigak, 60 miles northwest of Kabul. Copper is mined at 'Aynak, near Kabul, and uranium is extracted in the mountains near Khvajeh Rawash, east of Kabul. There are also deposits of copper, lead, and zinc near Konduz; beryllium in Khas Konar; chrome ore in the Lowgar valley near Herat; and the semiprecious stone lapis lazuli in Badakhshan. Afghanistan also has deposits of rock salt, beryl, barite, fluorspar, bauxite,
lithium, tantalum, gold, silver, asbestos, mica, and sulfur.