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_79056 ( "Name or route" text, "type" text, "elevation groundstation" real, "elevation mountainstation" real, "slope length" real, "capacity in persons/hour" real, "construction year(s)" text )

### Question ###
Which slope length has a type of surface lift, and an elevation groundstation smaller than 1974, and a construction year(s) of 1971, and a Name or route of alpmatten 1?

### Accurate SQL ###

SELECT "slope length" FROM table_79056 WHERE "type" = 'surface lift' AND "elevation groundstation" < '1974' AND "construction year(s)" = '1971' AND "Name or route" = 'alpmatten 1'