Historically, the past 75 years or so the average ratio between gold and silver has been about 35:1.

If you go back to about 3500 years the ratio was about 2:1, during Roman times it was about 12:1. The reason being is that in the distant past it was easier to find and produce gold than it was silver. Gold is often found in it's native form, while silver is nearly always found combined with other elements and compounds such as oxides, and sulfides. In ancient times they did not have the technology to as easily extract silver as they did gold; thus silver had a higher value than it did today, relatively speaking. The different costs of production of the two metals is still effecting the markets today. Gold and silver do not necessarily move in the same direction proportionately.

The greater divergence between silver and gold in recent years has been much greater; today it is 86:1. There are several reasons for this. I will mention one reason, and I hardly ever see anything written about this.

The vast majority of gold being produced is coming from gold mines. These mines only produce gold when it is economically feasible to produce it from the particular mine.

The vast majority of silver is produced as a byproduct from copper, lead, and gold mines, some comes from recycling also. Only a small percentage of silver actually comes from primary silver mines. This means that new silver is coming mostly as a byproduct. Since this silver is being produced as a byproduct, the economics of it's production aren't really of any consideration since it's just a residual product of things like copper production.

Think now of the increase in copper (and other metals) production in order to meet the demands from the switch to electric energy rather than carbon based fuels. There will be more and more silver coming on the market due to the increased mining of copper and other metals. Silver is then just a freebie to the copper/lead/gold mining companies, and it gets dumped on the market regardless of price.

I can think of one good use for silver coins

accepting payment from people in silver and paying in silver

because US mint Silver or US mint gold has a face value of what is marked on the face

so a 20 dollar golden eagle is 20 dollars face value and a silver dollar has a face value of 1 dollar

so if you bought a car from your cousin for 3 gold coins with a face value of 20 dollars each then you can report 60 dollars as the purchase price to pay tax on.
and he can claim 60 dollars as his income.