Apex domains cannot have CNAME records.
Question and response
Question
dig spring-miners.com. NS
Answer
spring-miners.com. 5 NS ns-1633.awsdns-12.co.uk.
spring-miners.com. 5 NS ns-1169.awsdns-18.org.
spring-miners.com. 5 NS ns-1477.awsdns-56.org.
spring-miners.com. 5 NS ns-1859.awsdns-40.co.uk.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0