1. Environmental concerns - One of the major disadvantages of PolyMet Mining Corp compared to its peers is the significant environmental concerns associated with its mining operations. The company's proposed copper-nickel mine in Minnesota has faced criticism and opposition due to potential water pollution, habitat destruction, and long-term environmental impacts.

2. Regulatory challenges - PolyMet Mining Corp has faced numerous regulatory challenges and legal battles in obtaining necessary permits and approvals for its mining projects. This has resulted in delays and increased costs, putting the company at a disadvantage compared to peers with smoother regulatory processes.

3. Financial risks - The company's mining projects require substantial upfront investments, and there is always a risk of cost overruns and lower-than-expected mineral prices. This financial risk can make PolyMet Mining Corp less attractive to investors compared to peers with more stable financial positions.

4. Lack of diversification - PolyMet Mining Corp primarily focuses on copper-nickel mining, which limits its diversification compared to peers engaged in multiple minerals or metals. This lack of diversification exposes the company to fluctuations in copper and nickel prices, making it more vulnerable to market volatility.

5. Community opposition - The company has faced significant opposition from local communities and indigenous groups concerned about the potential negative impacts of its mining operations. This opposition can lead to reputational damage and strained relationships, making it harder for PolyMet Mining Corp to operate compared to peers with better community relations.

6. Uncertain market demand - The demand for copper and nickel can be volatile, influenced by factors such as global economic conditions and technological advancements. PolyMet Mining Corp may face challenges in accurately predicting and meeting market demand, which can impact its profitability