Sombrerete and other questions RE: reading documents

I have been viewing LDS Film # 0604817 - "Registros Parroquiales - San Juan Bautisita, Sombrerete; Bautismos, 1863-1869". I am searching for children whose father is surnamed CASTRO or DUENAS (~ over N); also 'natural' children born to mothers with either surname. I do this in hopes of finding a connection to link what I know to the unknown.

Some of the records are for a church other than San Juan Bautista. The church is listed as "Iglesia de San Panteleon de la Noria" - and appears to be in the Sombrerete area.
QUESTION: Does anyone research in the Sombrerete area? Can anyone provide background information - historical/geographical for Sombrerete?

QUESTION: On some of the baptismal records the place of birth is listed as follows: "... nacio en la Noria" or "...nacio en este Mineral". Can anyone explain what these terms - en la Noria/ en este Mineral - mean?

QUESTION: On this film, in the first part, though identified as baptismal records, seem to be CIVIL birth records/ civil presentation - the wording is different, just not like the baptismal records. In these records I found a record of a child I believe is a collateral ancestor. However, when I looked for a baptismal record for the corresponding child/date - I didn't find one (I will have to check again to make sure I didn't overlook it). HAS ANYONE else run into this situation?

QUESTION: When/why are the titles of Don and Dona (~ over n) used?

Thanks for any enlightenment you can provide. I know I have asked several questions (In my mind they are related) - if you have an answer/reply to just one question, please cut-and-paste just the question for which you have a comment into the answer. (OK - just so you know - if this doesn't make sense, I apologize - this is how my mind works - logic is not my strong suite).

Natalie in VA