Estancia del Monte

Hello everyone, I’m just right to give up on researching a branch that motivated me to start with this hobby, I’ve gotten to around the year 1821 with Tomas Sanchez, son of Trinidad Sanchez and María del Carmen Sanchez,
In Tomas’s marriages that have been written in the parish books of Jilotlan de Los Dolores, it points out that Tomas is from Estancias del Monte Michoacan and his parents from Cotija Michoacan but later settled in Rio del Oro and in other documents in the ranch of San Pablo in the same area of el Rio del Oro. Does anyone in this forum have info of this so called Estancia del Monte or the origins of the Sanchez family last name in Cotija in the 1800s.
Hope to get news to continue on my research.