between 1980 and 2000. Many closed factories and plants lie unoccupied in the town. A number of former industries such as clothing and vehicle assembly have disappeared completely. Even though the term 'ghost town' can no longer apply to it, Ndola is yet to regain its economic glory of pre-1980 days. Refining There are no mines in Ndola itself, but the Bwana Mkubwa open-cast mine is only 10 km south-east of the city centre. Until their closure, copper and precious metals used to be brought from elsewhere in the Copperbelt for processing at the Ndola Copper Refinery and Precious Metals Refinery. Copper exports provide 70–80% of Zambia's export earnings, making the city very important to the country's economy. The Indeni Oil Refinery in Ndola supplies the whole country with refined petroleum. It was repaired in 2001 after being severely damaged by fire in 1999. GL Africa Energy, through its subsidiary Ndola Energy Company Limited, provides 105MW of power to the National Grid of Zambia. Power is generated from heavy fuel oil supplied by the Indeni Petroleum refinery. Commercial Ndola is home to one of the country's national newspapers, the Times of Zambia, as well as its printer, Printpak. These run as one company called TimesPrintpak. Catholic church run printing press, Mission Press, is also located in Ndola. Mission Press operates as a commercial entity. The headquarters of the Zambia Postal Service Corporation (Zampost) and workers compensation control board are located in Ndola. Zambia's ultra modern stadium in Ndola accommodates most Zambia international sports events. One mark of Ndola's commercial significance to Zambia is shown by the presence of the only major centre of operation for the country's central bank, the Bank of Zambia, outside of the capital, Lusaka. Every major bank in Zambia has at least one branch in Ndola. The largest insurance group in Zambia, ZSIC (pronounced 'zeesk'), own many commercial and residential properties in the city. Limestone Ndola has huge limestone reserves which are believed to be among the most homogeneous of their kind in the world. Limestone has therefore become to Ndola's economy what copper is to the rest of the country, providing much of the wealth and employment (Lime is a major component in the production of cement; a cement plant getting its lime from limestone and manufacturing a limestone cement will consume well over 80 kg limestone per 100 kg of cement produced). Between 1974