It appears that the week-day buses from Huelva to Rio Tinto continue on to Nerva, a fairly sizeable two-horse pueblo, we once passed through which is only 5kms from Minas de Rio Tinto. (It appears that the bus runs straight through to a pueblo called "Bea" and only starts dropping of and picking up from there en route to Nerva.)
So (a weekday example):
Dept: Huelva 09:30
Dept: Huelva 12:00
Dept: Huelva 18:00
Arr/Dep Minas de Rio Tinto:11:15
Arr/Dep Minas de Rio Tinto:13:45
Arr/Dep Minas de Rio Tinto:19:45
Arr: Nerva 11:30
Arr: Nerva 14:00
Arr: Nerva 20:00
Return:
Dept: Nerva 07:00
Dept: Nerva 09:00
Dept: Nerva 14:00
Dept: Nerva 16:00
Arr/Dep Minas de Rio Tinto:07:15
Arr/Dep Minas de Rio Tinto:09:10
Arr/Dep Minas de Rio Tinto:14:15
Arr/Dep Minas de Rio Tinto:16:15
Arr: Huelva 09:00
Arr: Huelva 10:45
Arr: Huelva 16:00
Arr: Huelva 18:00
Now, the Damas timetable states that there is also a bus service to/from Sevilla to Nerva (No. 501) as follows:
Dept Sevilla: 10:30
Dept Sevilla: 15:30
Dept Sevilla: 17:30
And back from Nerva at:
Dept Nerva: 05:15
Dept Nerva: 09:30
Dept Nerva: 18:30
This seems to be the Damas Sevilla Plaza das Armas to Zalamea La Real 501 Service. HOWEVER, nothing comes up on a search from Sevilla to Nerva with movelia.es. Based on what I have been able to gleen from searching Sevilla Plaza das Armas to Zalamea La Real on movelia.es , it seems to take the bus about 1hr 50 minutes to wander down from Sevilla to Nerva and v.v. It seems that the service does pass Rio Tinto 10 minutes earlier/later.
SEVILLA (Plaza de Armas) 10:00 / 10:00 0 Km
CAMAS 10:05 / 10:05 5 Km
BARRIADA DE SANTA CRUZ 10:10 / 10:10 7 Km
SANTIPONCE 10:15 / 10:15 11 Km
LAS PAJANOSAS 10:35 / 10:35 28 Km
EL GARROBO 10:45 / 10:45 40 Km
VENTA LA PLATA 10:55 / 10:55 50 Km
CASTILLO DE LAS GUARDAS 11:00 / 11:00 58 Km
MINAS CASTILLO DE LAS GUARDAS 11:10 / 11:10 63 Km
LA AULAGA 11:20 / 11:20 67 Km
NERVA 11:40 / 11:40 91 Km Parada inicial
RIOTINTO 11:50 / 11:50 95 Km
EL CAMPILLO 11:55 / 11:55 99 Km
It appears to me that as the buses cross the boundaries between the provinces of Sevilla and Huelva, the through routes are not being showing because of local fare subsidies.
So it looks like one could get the bus from Sevilla Estacion Autobus Plaza das Armas at 10:00, get to Riotinto at +- 11;50 and get the 18:25 (not Fridays before public holidays) back to Seville arriving at 20:10.
A search for the route of the following site seems to confirm this:http://www.autobusesplazadearmas.es/
