The Kachin region is abundant with valuable natural resources that include luxurious varieties of gems and woods. Although these substances are not strictly illegal, they are smuggled illegally into China where they are either sold globally on the black market or secretly mixed in with the legal supply. Furthermore, there is also a growing industry for narcotics and human trafficking in Kachin which has shown tremendous growth in recent years as the violence escalates. Jade Jade production in Myanmar exceeds $900 million each year. The majority of jade in Myanmar is found along the western edge of Kachin and centered around the remote village of Hpakant. Kachin is also regarded as producing some of the highest quality jade in the world. With government presence largely nonexistent in the region, jade mines in the Kachin region tend to be operated either directly by the KIA or local businesses that conduct business primarily through the KIA. Jade is then exported into China where demand for jade is incredibly high. This provides a significant portion of the KIA's funding. Timber The Kachin States vast quantity of wooded forests have attracted many Chinese businessmen who work with the KIA in producing, smuggling, and trading Burmese lumber in China. In the first ten months of 2013 alone, more than two million cubic meters of logs were shipped from Kachin through Ruili. This has contributed to deforestation in the region, as well as a large source of revenue for the rebel army. Border Disputes The Myanmar-China border is notoriously porous and blurred. Although the more than ten million people travel across the official border Checkpoint is in Ruili each year, there is no wall or guard legitimizing political boundaries anywhere along the border. Because of this, the majority of migrants are thought to enter and exit the countries illegally. For most Kachins, this is a daily routine in order to sell their goods or find work in China. Refugees Tens of thousands of Internally Displaced Persons have fled the fighting in the Kachin State to seek refuge in China and refugee camps. In April 2014, China sent a large number of armed border guards to patrol its border with the Kachin State and part of the Shan State. Additionally, China has closed down its major border checkpoints indefinitely and suspended its acceptance of Burmese refugees into the Yunnan Province. See also Internal conflict in Myanmar China–Myanmar