Mexican 1957-67 peso bullion value

Although I know they are only .100 silver, why does this coin not have a noted bullion value on Numista while other coins with low silver percentages do? I hope this isn't a stupid question! Thanks to anyone who can answer!
Loruca

I believe system has some low limit of calculated Silver content. I surely know that below .100 it is not calculated.

From NGC website

ASW: 0.0514oz
Melt Value: $1.02 (8/8/2016)

Cita: "Jarcek"​I believe system has some low limit of calculated Silver content. I surely know that below .100 it is not calculated.

By which factor is the​ limit set? (percentage or weight) because this coin (https://en.numista.com/catalogue/pieces81714.html) should contain more silver than this one https://en.numista.com/catalogue/pieces70730.html and their weight is comparable and yet only the second one shows a bullion value, and yet it has even less silver than the peso!
Loruca

2nd link is broken. But answer is still clear - one has purity set - Silver (.xxx) and second one has not.

Ok! thank you for the reply so coins without a specified finest don't show up in your bullion count! And coins with very low content also do not show up !
Loruca