Minerial rights on 4.8 acr. been pooled there is 67 now, how much roylity would we get each month?

Need more info this does not make sense.

My husband was left 4.8 ac, with other family members with it also; We went to where it is at and they are getting ready to frack, there are 6 names on board and i have the API # for the pad, We received a sign on bonus back last November 2013. A attorney called us from Antero and said if we would agree to them pooling. We agreed . right now there are 5 well heads there and 3 huge green tanks, and trying to get hold of landmen to see what and how much roality . We have paper work with husband getting 15% and at 1,800 an ac, This is very confusing to us, this is for oil and gas and where its at in Dodgridge county w,va said was wet gas which is better, and not counting the crude oil, Just trying to figure out what he would get every month, yet the wells not fracked yet