Solstice Trail questions, potential alternatives In the next few weeks, the Bureau of Land Management is expected to release its Environmental Analysis of the proposed expansion of a rock and gravel mine off CR 107 south of Salida. Hard Rock Paving & Redi-Mix is asking the BLM for permission to expand its existing mine by some 50 acres, extending the life of the operation by 20-40 years, depending on demand and amounts of aggregate found. Normally, the expansion of an existing gravel pit â one that is relatively small compared to others on BLM property â is a routine occurrence. The issue here is that a portion of a recently-developed mountain bike trail lies in the area of the proposed mine expansion.