Up 20% since June, are BHP shares a good buy today?

BHP Group Ltd (ASX: BHP) shares are edging lower today.

Shares in the S&P/ASX 200 Index (ASX: XJO) mining giant closed yesterday trading for $42.85. In late morning trade on Wednesday, shares are changing hands for $42.77 apiece, down 0.2%.

For some…