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The population engaged in mining is mainly based on Canton Hakkas, especially Jiaying and Huizhou. The so-called "no "mountain is not a guest", Luo Lin believes that "Hakka inhabited (China) inland, lack of agricultural products, rich in mineral resources, and accumulated a wealth of mining skills." The Hakka people who came to the south brought their mining skills to Southeast Asia. In the gold mining in northern Vietnam and West Borneo in the 18th and 19th centuries, along the west coast of the Malay Peninsula, Selangor extended to Bunga Island, Indonesia. In the mining boom of the Dongdao tin belt, all localities recruited Chinese workers, resulting in a large number of Hakkas, forming a Hakka regional settlement. Thereafter, after the expiration of the labor contract, they may be forced to fight, or when the mineral deposits are exhausted, they may turn to or become a local agricultural population. Some of the West Borneo Hakka miners flowed north to Sabah and Sarawak in the east, and the Hakkas who lived from the south of China, and formed Hakkas in Southeast Asia. The distribution is extremely extensive.