marble. Its proven reserve of chromium is about 5 million tons, the highest in the country, which is about 35–45% of the China's total resources (in a total area of ). It is being extracted in the Norbusa Chromite Mine. Other natural resources relate to construction industry such as marble, granite, limestone and clay, which are also abundant in the city. Industries The industrial sector in the city, apart from service sector trading, are industries in the fields of electricity, mining, farm-implement and vehicle repairing, cement, metallurgy, printing, pharmaceuticals, food processing. Light industries for processing of agricultural and livestock products and pharmaceuticals are widely adopted by replacing manual operation with mechanization and semi-mechanization. However, most textiles and leather processing are yet to be mechanized. Handicrafts The ethnic handicrafts of the city have a hoary history. This has generated many opportunities to develop the handicraft industry. The most significant handicrafts of the city, which have worldwide market, are the commercial products of utility, religious use and artistic crafts of the royal families of Tibet of the past. These are: The pulu blanket, Minzholin Tibetan incense and knitted products (of Zhanang County), bagdion apron (of Gonggar County), bracelets, necklaces, incense burner of Qonggyai, carpets and butter bottles of Qusum, popular stone utensils of Zaga and Sangri, Cona handcrafted wooden bowls, butter tea Cup of Jiyayu, knife of Lhunzi (gilded with silver), Nagarze silver tea cup, jade ware of Quingje County and Tibetan quilt. Other famous consumer products are the butter of Lagong and dried meat of Yamzhog. Landmarks The city has very unusual and rich historical monuments, natural geological features such as lakes and caves, scenic regions and religiously linked mountains. This has given a boost to the tourism industry. Some of the important landmarks are; the Lagyable Palace; the Yungbulakang Palace, the first palace in Tibet; the Tombs of Tibetan Kings; Jagsamqionpori, Gangobari of Zatong and Habort mountains, which are venerated; lakes such as Yamzogh Yumcog in Nagarzê County and the Lhamai Laco of Gyacha, which are considered as sacred; and religious places of worship such as the Dorje Drak Monastery (also spelt Do-rje-brag, or Dorjezha Monastery), the Quamzhub Monastery which is under state control, the Samding Monastery, the Samyas Monastery (the first monastery built in Tibet), Quinpu Meditation Cave and the Zayang Zang Karst Cave. Some of the notable monuments and monasteries are in the National Heritage list. Yumbulakhar Palace