spoke to firearms branch they referred me to Firearms Regulations 2008 and advised that someone unlicenced can shoot on my property when in direct supervision with me (
http://www.legislation.sa.gov.au/LZ/C/R/FIREARMS%20REGULATIONS%202008/CURRENT/2008.239.UN.PDFDivision 5—Exemptions relating to licences
23—Exemption from requirement to be licensed
(1) An offence is not committed against section 11 of the Act in the following
circumstances:
(a) by a person of or over the age of 14 years but under the age of 18 years who
has possession of or uses a registered firearm if—
(i) he or she is with, and is under the continuous supervision of, his or
her parent or guardian or some other person approved by his or her
parent or guardian; and
(ii) the person providing the supervision holds a firearms licence
authorising possession of the firearm for the purpose for which it is
being used;
(b) by a person of or over the age of 14 years but under the age of 18 years who
has possession of or uses a firearm if that person is (with the consent of his or
her parent or guardian) with, and is under the continuous supervision of, a
recognised coach who holds a firearms licence authorising possession of the
firearm for the purpose for which it is being used;
(c) by a person who has possession of or uses a firearm for the purpose of a
course or examination in the safe handling, carriage and use of firearms if that
person is with, and is under the continuous supervision of, a person
authorised by the Registrar to conduct the course or examination;
(
d) by a person of or over the age of 18 years who has possession of or uses a
firearm if that person is with, and is under the continuous supervision of, a
person who is registered as the owner of the firearm and who holds a firearms
licence authorising possession of the firearm for the purpose for which it is
being used;