Count the lowest Year which has gas explosion, Colliery of tylorstown colliery, and a Death toll larger than 57?
CREATE TABLE "mining_disasters_in_the_rhondda_valley_1" (
  "colliery" text,
  "location" text,
  "date" text,
  "year" real,
  "death_toll" real,
  "cause" text
);
SELECT MIN("year") FROM "mining_disasters_in_the_rhondda_valley_1" WHERE "cause"='gas explosion' AND "colliery"='tylorstown colliery' AND "death_toll">57;