Here are a few links of possible interest to check out from Google--some of them look better (or at least more "scholarly" and not just ordinary news articles) than others, and most seem to date to around 2009-2010 (which may be when international awareness first dawned regarding this new migration stream?). Some of these articles appear to discuss West Africans or other Africans who may stay in parts of South America like Argentina or Brazil; other articles concern West Africans who land in South or Central America in hopes of migrating northward to the United States.
This may all be stuff you have already, but in case not and it might be helpful, here are some sources for whatever they may be worth:
More African Immigrants Finding a Home in Latin America ...
Jan 25, 2010 - Latin America is becoming an increasingly common destination for African immigrants as Europe tightens its immigration controls and suffers ...
African immigrants drift toward Latin America - Reuters
Nov 15, 2009 - Stowed away on cargo ships and unsure where their dangerous journeys will take them, increasing numbers of African immigrants are arriving ...
[PDF]Recent African migration to South America: The case of Senegalese in ...
African migration to Latin America is new and is made up by mixed migration flow . ... country of destination for one flow of West Africans, mainly Senegalese, ...
Argentina is at the core of the South America migration system with about 1.5 million ... although evidence that conflicts in West Africa were provided as reasons.
Nov 10, 2010 - A meeting in Brazil will discuss mixed migratory movements in the Americas, including the growing numbers of Asian and African refugees in ...Missing: west
Jan 16, 2017 - Experts also say surge north reflects push by migrants to reach US, reunite with relatives before President-elect Donald Trump takes office on ...
Jun 21, 2016 - Costa Rica is experiencing an increase in migration from Africa, signaling ... by boat or airplane from Spain, Portugal, or countries in western Africa. After arriving in South America -- usually in Colombia or Brazil -- the migrants ...
Sep 23, 2016 - In South America, Justine saved $1,200 working as a meat packer ... Laws in the West African country call for a five-year prison sentence for ...