So regular is this occurrence that it's tempting to suggest the axiom that, if Antofagasta's shares are a main mover on day one, then on day two they will be a main mover in the opposite direction. Okay, I know that won't actually work out, if only because today's rise (Tuesday's) ends a run when the shares dropped heavily four days out of five. Nevertheless, it does seem that the shares have a peculiarly bouncy tendency - up one day, down the next.
Maybe this is simply because Antofagasta is a mining share and we all know that such stocks are supposed to be a geared play on the price of the commodity that affects them most. This has come to seem normal - that commodity prices will be volatile and that shares in mining companies will be even more volatile, even though only limited logic says it must be so.