Representatives from the Sloan Canyon National Conservation Area are set to share information about the volcano formations in the area during a program intended for ages 18 or older. Space is limited, and reservations are required for the free program. In November 2002, Congress designated the Sloan Canyon National Conservation Area to preserve and protect a portion of Southern Nevadaโs Mojave Desert for future generations.ย The 48,438-acre national conservation area forms the southern mountainous skyline of Las Vegas and the city of Henderson.