Below is the list of tables from the database along with their columns and datatype. Need to generate an accurate SQL query for the question.
Only use the columns present in the respective table. Only use the columns which are required to generate the SQL query. Only use table joins if required and not otherwise.

### Tables ###
TABLE: CREATE TABLE table_57501 ( "City of license/market" text, "Station" text, "Channel TV ( RF )" text, "Year of affiliation" real, "Year of disaffiliation" real )

### Question ###
What is the earliest year of disaffiliation of a CHCH-TV station, licensed in Hamilton, Ontario?

### Accurate SQL ###

SELECT MIN("Year of disaffiliation") FROM table_57501 WHERE "City of license/market" = 'hamilton, ontario'