Below is an context that describes a sql query, paired with an question that provides further information. Write an answer that appropriately completes the request.  # noqa: E501
### Context:
CREATE TABLE table_name_60 (rank INTEGER, source_of_copper VARCHAR)
### Question:
What's the lowest ranking source of copper, copper ore, concentrated and leached?
### Answer:
SELECT MIN(rank) FROM table_name_60 WHERE source_of_copper = "copper ore, concentrated and leached"