Over the long term, funds allocation towards major producers are more profitable. Juniors respond faster at important turns of Gold price, which is also why this ratio is a great indicator for major swings. It captures volatility/liquidity i.e
smart/dump money changing positions.
Looks like money flows in the system as the ratio between explorers/producers (last one below in yellow) is creating a round bottom, kind of IH&S formation
If this not is a sign of confidence in the sector regarding long term investing I don't know what else is.