Nearly 70,000 workers migrate annually to South Africa’s gold mines.68 Although the adult HIV prevalence rate in Mozambique is approximately 11.5 percent, in the two provinces from which most miners are recruited, the prevalence rates are dramatically higher (i.e. 20 and 25 percent in Maputo and Gaza, respectively). TB has increased rapidly in both provinces in the past 15 years, with 75 percent of TB patients co-infected with HIV, compared with 58 percent nationwide.69 The International Organization for Migration estimated that the cost to Mozambique of migration-related health spending was US$800 million.