1. Environmental concerns: Belo Sun Mining Corp has faced significant opposition and criticism due to its proposed mining project in the Amazon rainforest. Environmental activists and local communities have raised concerns about the potential destruction of the ecosystem and the impact on indigenous communities.

2. Regulatory challenges: The company has faced regulatory hurdles and legal battles in obtaining necessary permits and approvals for its mining project. This has resulted in delays and uncertainties, affecting the company's ability to move forward with its operations.

3. Financial risks: Belo Sun Mining Corp has faced financial challenges, including difficulties in securing funding for its mining project. This has led to increased debt and limited financial resources, which may hinder the company's ability to compete with its peers.

4. Lack of diversification: The company's focus on a single mining project in Brazil may limit its ability to diversify its operations and revenue streams. This lack of diversification exposes the company to greater risks, such as fluctuations in commodity prices or changes in government policies.

5. Reputation damage: The controversies surrounding Belo Sun Mining Corp's mining project and the opposition it has faced have damaged the company's reputation. This may affect its ability to attract investors, secure partnerships, or gain social acceptance in the industry.

6. Social license to operate: The company has struggled to obtain a social license to operate from local communities and indigenous groups. This lack of social acceptance can lead to protests, legal challenges, and reputational damage, ultimately impacting the company's ability to operate successfully compared to its peers.