Is Bullionvault halal?


I am interested in buying gold and silver using bullionvault, and would like to know whether this is a halal way of doing so. I beleive that bullionvault was listed on the IFG investment comparison tool in the past, but is no longer listed. Bullionvault is also mentioned in a number of articles on IFG. The only method of buying gold currently listed on their comparison tool is the Minted app. Does anyone know why they have removed Bullionvault from the list? I don’t mind signing up to Minted, but want exposure to silver. Are there any halal ETFs for silver.