I have a rather sizable amount of agricultural waste that is organic and entirely compost-able. The thing is that it has NOT been through the composting process. Some of the material that is there would be two-three years old. There is fresher material on top of this (this is grape pomace and stems and such from a winery). Is the whole lot viable to compost or do we need to dispose of it and begin afresh? I would like to compost the whole lot if possible even if the resulting compost is not necessarily of commercial grade quality but would be at least a form of soil that could still be utilized on marginal/non-commercial parts of the property. Any answers or suggestions would be appreciated.